Reorganize the org.scalajs.dom namespace into something saner

- The raw "everything goes" namespace is now org.scalajs.dom.raw
- org.scalajs.dom.{css, html, idb, svg, webgl} namespaces contain un-prefixed versions of the things that start with their prefix. The `Element` suffix has also been dropped where possible
- org.scalajs.dom.extensions has been renamed to org.scalajs.dom.ext
- org.scalajs.dom itself contains all things in org.scalajs.dom.raw that aren't in any of the un-prefixed namespaces

Overall, this should accomplish a few things:

- Massively clean up org.scalajs.dom.*, since we've moved ~270 names into proper namespaces
- Make dealing with these names much easier, e.g. now `dom.HTMLTableCellElement` is just `html.TableCell`
- Make a clear separation between "all un-modified dom facades" and "re-organized nice-to-use dom facades", so hopefully there won't be any confusion over things missing or where things should go
- Reasonable backwards compat just by changing imports: org.scalajs.dom -> org.scalajs.dom.raw and things should keep working

Some Caveats:

- The mapping isn't *quite* perfect: we still have `svg.RectElement` instead of just `svg.Rect`, sinct `svg.Rect` is taken by something else
- You don't get doc-dropdown in IntelliJ because of the aliases. I assume this is something we can bug the IntelliJ people to fix since it affects lots of other things (e.g. the std lib) and not just Scala.js

Author: Li Haoyi

Diff for: example/src/main/scala/example/Example.scala

@@ -1,9 +1,7 @@
 package example
 
-import scala.scalajs.js.JSApp
-
 import org.scalajs.dom
-
+import dom.html
 import scala.scalajs.js.annotation.JSExport
 
 @JSExport
@@ -18,7 +16,7 @@ object Alert {
 @JSExport
 object NodeAppendChild {
   @JSExport
-  def main(div: dom.HTMLDivElement) = {
+  def main(div: html.Div) = {
     val child = dom.document
                    .createElement("div")
 
@@ -32,7 +30,7 @@ object NodeAppendChild {
 @JSExport
 object ElementStyle {
   @JSExport
-  def main(div: dom.HTMLDivElement) = {
+  def main(div: html.Div) = {
     val colors = Seq(
       "red", "green", "blue"
     )
@@ -47,8 +45,7 @@ object ElementStyle {
 @JSExport
 object LocalStorage {
   @JSExport
-  def main(in: dom.HTMLInputElement,
-           box: dom.HTMLDivElement) = {
+  def main(in: html.Input, box: html.Div) = {
     val key = "my-key"
 
     in.value =
@@ -67,7 +64,7 @@ object LocalStorage {
 @JSExport
 object Canvas {
   @JSExport
-  def main(c: dom.HTMLCanvasElement) = {
+  def main(c: html.Canvas) = {
     type Ctx2D =
       dom.CanvasRenderingContext2D
     val ctx = c.getContext("2d")
@@ -93,8 +90,8 @@ object Canvas {
 @JSExport
 object Base64 {
   @JSExport
-  def main(in: dom.HTMLInputElement,
-           out: dom.HTMLDivElement) = {
+  def main(in: html.Input,
+           out: html.Div) = {
     in.onkeyup = { (e: dom.Event) =>
       out.textContent =
         dom.btoa(in.value)
@@ -105,7 +102,7 @@ object Base64 {
 @JSExport
 object EventHandler{
   @JSExport
-  def main(pre: dom.HTMLPreElement) = {
+  def main(pre: html.Pre) = {
     pre.onmousemove = {
       (e: dom.MouseEvent) =>
         pre.textContent =
@@ -123,7 +120,7 @@ object EventHandler{
 @JSExport
 object XMLHttpRequest{
   @JSExport
-  def main(pre: dom.HTMLPreElement) = {
+  def main(pre: html.Pre) = {
     val xhr = new dom.XMLHttpRequest()
     xhr.open("GET",
       "http://api.openweathermap.org/" +
@@ -142,8 +139,8 @@ object XMLHttpRequest{
 @JSExport
 object Websocket {
   @JSExport
-  def main(in: dom.HTMLInputElement,
-           pre: dom.HTMLPreElement) = {
+  def main(in: html.Input,
+           pre: html.Pre) = {
     val echo = "ws://echo.websocket.org"
     val socket = new dom.WebSocket(echo)
     socket.onmessage = {
@@ -162,8 +159,8 @@ object Websocket {
 @JSExport
 object AjaxExtension {
   @JSExport
-  def main(pre: dom.HTMLPreElement) = {
-    import dom.extensions.Ajax
+  def main(pre: html.Pre) = {
+    import dom.ext.Ajax
     import scalajs.concurrent
                   .JSExecutionContext
                   .Implicits

Diff for: src/main/scala/org/scalajs/dom/css.scala

@@ -0,0 +1,19 @@
+package org.scalajs.dom
+
+/**
+ * Short aliasas of all the dom.CSSThing classes
+ */
+object css {
+  type FontFaceRule = raw.CSSFontFaceRule
+  type ImportRule = raw.CSSImportRule
+  type KeyframeRule = raw.CSSKeyframeRule
+  type MediaRule = raw.CSSMediaRule
+  type NamespaceRule = raw.CSSNamespaceRule
+  type PageRule = raw.CSSPageRule
+  type Rule = raw.CSSRule
+  @inline def Rule = raw.CSSRule
+  type RuleList = raw.CSSRuleList
+  type StyleDeclaration = raw.CSSStyleDeclaration
+  type StyleSheet = raw.CSSStyleSheet
+  type StyleRule = raw.CSSStyleRule
+}

Diff for: src/main/scala/org/scalajs/dom/extensions/Extensions.scala renamed to src/main/scala/org/scalajs/dom/ext/Extensions.scala

@@ -1,4 +1,6 @@
-package org.scalajs.dom.extensions
+package org.scalajs.dom.ext
+
+import org.scalajs.dom.html
 
 import scala.scalajs.js
 import org.scalajs.dom
@@ -80,7 +82,7 @@ object Image {
     val img =
       dom.document
         .createElement("img")
-        .asInstanceOf[dom.HTMLImageElement]
+        .asInstanceOf[html.Image]
 
     img.src = "data:image/svg+xml;base64," + s
     img
@@ -199,7 +201,7 @@ object Ajax{
             withCredentials: Boolean, 
             responseType: String): Future[dom.XMLHttpRequest] = {
     val req = new dom.XMLHttpRequest()
-    val promise = Promise[dom.XMLHttpRequest]
+    val promise = Promise[dom.XMLHttpRequest]()
 
     req.onreadystatechange = {(e: dom.Event) =>
       if (req.readyState.toInt == 4){

Diff for: src/main/scala/org/scalajs/dom/extensions/KeyValue.scala renamed to src/main/scala/org/scalajs/dom/ext/KeyValue.scala

@@ -1,4 +1,4 @@
-package org.scalajs.dom.extensions
+package org.scalajs.dom.ext
 
 /**
  * The KeyboardEvent.key attribute of an event must always contain one of these control key or character values (even if

Diff for: src/main/scala/org/scalajs/dom/extensions/package.scala renamed to src/main/scala/org/scalajs/dom/ext/package.scala

@@ -2,31 +2,29 @@ package org.scalajs.dom
 
 import scala.language.implicitConversions
 
-import scala.scalajs.js
-import org.scalajs.dom
 import scala.collection.mutable
 
-package object extensions {
+package object ext {
 
-  implicit class PimpedNodeList(nodes: dom.NodeList) extends EasySeq[dom.Node](nodes.length, nodes.apply)
+  implicit class PimpedNodeList(nodes: NodeList) extends EasySeq[Node](nodes.length, nodes.apply)
 
-  implicit class PimpedTouchList(nodes: dom.TouchList) extends EasySeq[dom.Touch](nodes.length, nodes.apply)
+  implicit class PimpedTouchList(nodes: TouchList) extends EasySeq[Touch](nodes.length, nodes.apply)
 
-  implicit class PimpedHtmlCollection(coll: dom.HTMLCollection) extends EasySeq[dom.Element](coll.length, coll.apply)
+  implicit class PimpedHtmlCollection(coll: html.Collection) extends EasySeq[Element](coll.length, coll.apply)
 
-  implicit class PimpedSVGTransformList(coll: dom.SVGTransformList) extends EasySeq[dom.SVGTransform](coll.numberOfItems, coll.getItem)
+  implicit class PimpedSVGTransformList(coll: svg.TransformList) extends EasySeq[svg.Transform](coll.numberOfItems, coll.getItem)
 
   implicit class Castable(x: Any) {
     def cast[T] = x.asInstanceOf[T]
   }
 
-  implicit def pimpAnimatedNumber(x: dom.SVGAnimatedNumber) = x.baseVal
+  implicit def pimpAnimatedNumber(x: svg.AnimatedNumber) = x.baseVal
 
-  implicit def pimpRichAnimatedNumber(x: dom.SVGAnimatedNumber) = x.baseVal: runtime.RichDouble
+  implicit def pimpRichAnimatedNumber(x: svg.AnimatedNumber) = x.baseVal: runtime.RichDouble
 
-  implicit def pimpAnimatedLength(x: dom.SVGAnimatedLength) = x.baseVal.value
+  implicit def pimpAnimatedLength(x: svg.AnimatedLength) = x.baseVal.value
 
-  implicit def pimpRichAnimatedLength(x: dom.SVGAnimatedLength) = x.baseVal.value: runtime.RichDouble
+  implicit def pimpRichAnimatedLength(x: svg.AnimatedLength) = x.baseVal.value: runtime.RichDouble
 
   implicit def color2String(c: Color) = c.toString
   implicit class pimpedContext(val ctx: CanvasRenderingContext2D) {
@@ -69,7 +67,6 @@ package object extensions {
     }
   }
 
-
   /**
    * Implicit class to deal with attributes as with normal mutable Map
    * @param attributes
@@ -80,7 +77,6 @@ package object extensions {
     override def iterator: Iterator[(String, Attr)] = new Iterator[(String, Attr)] {
       var index = 0
 
-
       override def next(): (String, Attr) = {
         val n: Attr = attributes.item(index)
         this.index = this.index + 1
@@ -90,15 +86,13 @@ package object extensions {
       override def hasNext: Boolean = index < self.length
     }
 
-
     override def get(key: String): Option[Attr] = attributes.getNamedItem(key) match {
       case null => None
       case attr => Some(attr)
     }
 
     def length: Int = attributes.length.toInt
 
-
     override def -=(key: String) = {
       attributes.removeNamedItem(key)
       this
@@ -108,6 +102,4 @@ package object extensions {
       attributes.setNamedItem(kv._2)
       this}
   }
-
-
 }

Diff for: src/main/scala/org/scalajs/dom/html.scala

@@ -0,0 +1,85 @@
+package org.scalajs.dom
+
+/**
+ * Short aliasas of all the dom.HTMLThing classes
+ */
+object html {
+  type Anchor = raw.HTMLAnchorElement
+  type Applet = raw.HTMLAppletElement
+  type Audio = raw.HTMLAudioElement
+  type Area = raw.HTMLAreaElement
+  type AreasCollection = raw.HTMLAreasCollection
+  type Base = raw.HTMLBaseElement
+  type BaseFont = raw.HTMLBaseFontElement
+  type BGSound = raw.HTMLBGSoundElement
+  type BlockElement = raw.HTMLBlockElement
+  type Body = raw.HTMLBodyElement
+  type Button = raw.HTMLButtonElement
+  type BR = raw.HTMLBRElement
+  type Canvas = raw.HTMLCanvasElement
+  type Collection = raw.HTMLCollection
+  type DataList = raw.HTMLDataListElement
+  type DD = raw.HTMLDDElement
+  type Directory = raw.HTMLDirectoryElement
+  type Div = raw.HTMLDivElement
+  type DList = raw.HTMLDListElement
+  type DT = raw.HTMLDTElement
+  type Document = raw.HTMLDocument
+  type Element = raw.HTMLElement
+  type Embed = raw.HTMLEmbedElement
+  type FieldSet = raw.HTMLFieldSetElement
+  type Font = raw.HTMLFontElement
+  type Form = raw.HTMLFormElement
+  type Frame = raw.HTMLFrameElement
+  type FrameSet = raw.HTMLFrameSetElement
+  type Head = raw.HTMLHeadElement
+  type Heading = raw.HTMLHeadingElement
+  type Html = raw.HTMLHtmlElement
+  type HR = raw.HTMLHRElement
+  type IFrame = raw.HTMLIFrameElement
+  type Image = raw.HTMLImageElement
+  type Input = raw.HTMLInputElement
+  type IsIndex = raw.HTMLIsIndexElement
+  type Label = raw.HTMLLabelElement
+  type Legend = raw.HTMLLegendElement
+  type LI = raw.HTMLLIElement
+  type Link = raw.HTMLLinkElement
+  type Map = raw.HTMLMapElement
+  type Marquee = raw.HTMLMarqueeElement
+  type Media = raw.HTMLMediaElement
+  @inline def Media = raw.HTMLMediaElement
+  type Menu = raw.HTMLMenuElement
+  type Meta = raw.HTMLMetaElement
+  type Mod = raw.HTMLModElement
+  type NextIdElement = raw.HTMLNextIdElement
+  type Object = raw.HTMLObjectElement
+  type OList = raw.HTMLOListElement
+  type OptGroup = raw.HTMLOptGroupElement
+  type Option = raw.HTMLOptionElement
+  type Paragraph = raw.HTMLParagraphElement
+  type Param = raw.HTMLParamElement
+  type Pre = raw.HTMLPreElement
+  type Phrase = raw.HTMLPhraseElement
+  type Progress = raw.HTMLProgressElement
+  type Quote = raw.HTMLQuoteElement
+  type Script = raw.HTMLScriptElement
+  type Select = raw.HTMLSelectElement
+  type Source = raw.HTMLSourceElement
+  type Span = raw.HTMLSpanElement
+  type Style = raw.HTMLStyleElement
+  type Table = raw.HTMLTableElement
+  type TableAlignment = raw.HTMLTableAlignment
+  type TableCaption = raw.HTMLTableCaptionElement
+  type TableCell = raw.HTMLTableCellElement
+  type TableCol = raw.HTMLTableColElement
+  type TableDataCell = raw.HTMLTableDataCellElement
+  type TableHeaderCell = raw.HTMLTableHeaderCellElement
+  type TableRow = raw.HTMLTableRowElement
+  type TableSection = raw.HTMLTableSectionElement
+  type Title = raw.HTMLTitleElement
+  type TextArea = raw.HTMLTextAreaElement
+  type Track = raw.HTMLTrackElement
+  type UList = raw.HTMLUListElement
+  type Unknown = raw.HTMLUnknownElement
+  type Video = raw.HTMLVideoElement
+}

Diff for: src/main/scala/org/scalajs/dom/idb.scala

@@ -0,0 +1,22 @@
+package org.scalajs.dom
+
+/**
+ * Short aliasas of all the dom.IDBThing classes
+ */
+object idb {
+  type Cursor = raw.IDBCursor
+  @inline def Cursor = raw.IDBCursor
+  type CursorWithValue = raw.IDBCursorWithValue
+  type Database = raw.IDBDatabase
+  type Environment = raw.IDBEnvironment
+  type Factory = raw.IDBFactory
+  type Index = raw.IDBIndex
+  type KeyRange = raw.IDBKeyRange
+  @inline def KeyRange = raw.IDBKeyRange
+  type ObjectStore = raw.IDBObjectStore
+  type OpenDBRequest = raw.IDBOpenDBRequest
+  type Request = raw.IDBRequest
+  type Transaction = raw.IDBTransaction
+  @inline def Transaction = raw.IDBTransaction
+  type VersionChangeEvent = raw.IDBVersionChangeEvent
+}