[v1-legacy] Handle youtube /live/ URLs. (#54)

* Handle youtube /live/ URLs.

* Use substring method as Lavaplayer will trim extra characters.

* consistent naming (LivePath -> Live)

Author: devoxin

Diff for: main/src/main/java/com/sedmelluq/discord/lavaplayer/source/youtube/DefaultYoutubeLinkRouter.java

@@ -29,7 +29,8 @@ public class DefaultYoutubeLinkRouter implements YoutubeLinkRouter {
     new Extractor(Pattern.compile("^" + PROTOCOL_REGEX + DOMAIN_REGEX + "/.*"), this::routeFromMainDomain),
     new Extractor(Pattern.compile("^" + PROTOCOL_REGEX + SHORT_DOMAIN_REGEX + "/.*"), this::routeFromShortDomain),
     new Extractor(Pattern.compile("^" + PROTOCOL_REGEX + DOMAIN_REGEX + "/embed/.*"), this::routeFromEmbed),
-    new Extractor(Pattern.compile("^" + PROTOCOL_REGEX + DOMAIN_REGEX + "/shorts/.*"), this::routeFromShorts)
+    new Extractor(Pattern.compile("^" + PROTOCOL_REGEX + DOMAIN_REGEX + "/shorts/.*"), this::routeFromShorts),
+    new Extractor(Pattern.compile("^" + PROTOCOL_REGEX + DOMAIN_REGEX + "/live/.*"), this::routeFromLive)
   };
 
   @Override
@@ -118,6 +119,11 @@ protected <T> T routeFromShorts(Routes<T> routes, String url) {
     return routeFromUrlWithVideoId(routes, urlInfo.path.substring(8), urlInfo);
   }
 
+  protected <T> T routeFromLive(Routes<T> routes, String url) {
+    UrlInfo urlInfo = getUrlInfo(url, true);
+    return routeFromUrlWithVideoId(routes, urlInfo.path.substring(6), urlInfo);
+  }
+
   private static UrlInfo getUrlInfo(String url, boolean retryValidPart) {
     try {
       if (!url.startsWith("http://") && !url.startsWith("https://")) {