Add new feature to breakout rooms that allows to freely join them.

...ain/scala/org/bigbluebutton/core/apps/BreakoutModel.scala

...utton/core/apps/breakout/BreakoutRoomCreatedMsgHdlr.scala

...ebutton/core/apps/breakout/BreakoutRoomsListMsgHdlr.scala

...on/core/apps/breakout/CreateBreakoutRoomsCmdMsgHdlr.scala

.../scala/org/bigbluebutton/core/domain/BreakoutRoom2x.scala

...n/scala/org/bigbluebutton/core/models/BreakoutRooms.scala

...n/core/pubsub/senders/MeetingMessageToJsonConverter.scala

...g/bigbluebutton/messages/CreateMeetingRequestPayload.java

...in/scala/org/bigbluebutton/common2/domain/Meeting2x.scala

...n/scala/org/bigbluebutton/common2/msgs/BreakoutMsgs.scala

...b/src/main/java/org/bigbluebutton/api/MeetingService.java

.../main/java/org/bigbluebutton/api/ParamsProcessorUtil.java

...b/src/main/java/org/bigbluebutton/api/domain/Meeting.java

...bluebutton/api/messaging/messages/CreateBreakoutRoom.java

...ain/java/org/bigbluebutton/api/pub/IPublisherService.java

...src/main/java/org/bigbluebutton/api2/IBbbWebApiGWApp.java

...rc/main/scala/org/bigbluebutton/api2/BbbWebApiGWApp.scala

.../main/scala/org/bigbluebutton/api2/domain/Recording.scala

...org/bigbluebutton/api2/meeting/MeetingsManagerActor.scala

...g/bigbluebutton/api2/meeting/OldMeetingMsgHdlrActor.scala