Added a message for when a default group chat is being created

...n/core/apps/groupchats/CreateDefaultPublicGroupChat.scala

...la/org/bigbluebutton/core/apps/groupchats/GroupChat.scala

...g/bigbluebutton/core/apps/groupchats/GroupChatHdlrs.scala

...e/apps/presentationpod/CreateDefaultPresentationPod.scala

.../presentationpod/CreateNewPresentationPodPubMsgHdlr.scala

...n/scala/org/bigbluebutton/core/running/MeetingActor.scala

.../org/bigbluebutton/core2/message/senders/MsgBuilder.scala