Move visitor classes according to PSR-4 (#170)

Author: szepeviktor

Diff for: .gitattributes

@@ -10,5 +10,6 @@
 /phpunit.xml.dist export-ignore
 /release-latest-versions.sh export-ignore
 /source/ export-ignore
+/src/ export-ignore
 /visitor.php export-ignore
 /tests/ export-ignore

Diff for: composer.json

@@ -25,6 +25,9 @@
     },
     "minimum-stability": "stable",
     "autoload-dev": {
+        "psr-4": {
+            "PhpStubs\\WordPress\\Core\\": "src/"
+        },
         "classmap": [
             "tests/"
         ]
@@ -43,9 +46,9 @@
         "post-update-cmd": "@composer --working-dir=source/ update --no-interaction",
         "cleanup": "git status --short --ignored | sed -n -e 's#^!! ##p' | xargs -r rm -vrf",
         "test": [
-            "@test:cs",
+            "@test:phpunit",
             "@test:phpstan",
-            "@test:phpunit"
+            "@test:cs"
         ],
         "test:cs": "phpcs",
         "test:cs:fix": "phpcbf",

Diff for: phpcs.xml.dist

@@ -2,7 +2,8 @@
 <ruleset>
     <file>finder.php</file>
     <file>functionMap.php</file>
-    <!-- <file>visitor.php</file> -->
+    <file>src/</file>
+    <file>visitor.php</file>
 
     <rule ref="PSR12NeutronRuleset">
         <exclude name="Generic.Files.LineLength"/>

Diff for: phpstan.neon.dist

@@ -3,6 +3,7 @@ parameters:
         - finder.php
         - functionMap.php
         - visitor.php
+        - src/
         - tests/
     excludePaths:
         - tests/data/