cleanup of old java messages and other unused code

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

...src/main/java/org/bigbluebutton/core/api/IDispatcher.java

...src/main/java/org/bigbluebutton/core/api/IOutMessage.java

...in/java/org/bigbluebutton/core/api/MessageOutGateway.java

.../java/org/bigbluebutton/core/api/OutMessageListener2.java

...ebutton/core/pubsub/receivers/MeetingMessageReceiver.java

...g/bigbluebutton/core/pubsub/receivers/MessageHandler.java

.../bigbluebutton/core/pubsub/receivers/ReceivedMessage.java

...luebutton/core/pubsub/receivers/RedisMessageReceiver.java

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

...src/main/java/org/bigbluebutton/core/util/WebApiUtil.java

akka-bbb-apps/src/main/scala/org/bigbluebutton/Boot.scala

...rc/main/scala/org/bigbluebutton/SystemConfiguration.scala

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

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

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

...scala/org/bigbluebutton/core/OutMessageGatewayActor.scala

...n/scala/org/bigbluebutton/core/OutMessageGatewayImp.scala

.../scala/org/bigbluebutton/core/api/ConsoleDispatcher.scala

...src/main/scala/org/bigbluebutton/core/api/Constants.scala