Split RawHtmlMarkupFormatter into a bundled plugin (antisamy-markup-formatter).

https://trello.com/c/NvZt4WXu/15-rawhtmlmarkupformatter

core/src/main/java/hudson/ClassicPluginStrategy.java

@@ -273,7 +273,8 @@ public class ClassicPluginStrategy implements PluginStrategy {
         new DetachedPlugin("pam-auth","1.467.*","1.0"),
         new DetachedPlugin("mailer","1.493.*","1.2"),
         new DetachedPlugin("matrix-auth","1.535.*","1.0.2"),
-        new DetachedPlugin("windows-slaves","1.547.*","1.0")
+        new DetachedPlugin("windows-slaves","1.547.*","1.0"),
+        new DetachedPlugin("antisamy-markup-formatter","1.553.*","1.0")
     );
 
     /**