Cleaning up some unused transcode akka-apps methods

...n/java/org/bigbluebutton/core/api/IBigBlueButtonInGW.java

...luebutton/core/pubsub/receivers/UsersMessageReceiver.java

...main/scala/org/bigbluebutton/core/BigBlueButtonInGW.scala

.../src/main/scala/org/bigbluebutton/core/MeetingActor.scala

...ain/scala/org/bigbluebutton/core/MessageSenderActor.scala

...rc/main/scala/org/bigbluebutton/core/api/InMessages.scala

...c/main/scala/org/bigbluebutton/core/api/OutMessages.scala

...src/main/scala/org/bigbluebutton/core/apps/VideoApp.scala

...c/main/scala/org/bigbluebutton/core/apps/VideoModel.scala