Implement basic GroupChat messages

Merge #4842 to bbb2.2

Added missing messages for presentation pods and group chats

Fix compile error

End meeting when last authed user left

Better params check and logging for RTMP connections

Pull BBB 2.0 into BBB 2.2

Pulled HTML5 locales - July 03, 2018

Moderator only message support.

Prevent settings modal re-opening after dismiss

Typing chat on iPhone partially hides the post button

Whiteboard fixes and improvements

Add some messages about audio errors

Fixed audio state bug (#5519)

Fixed full audio exit when SFU listen only is enabled

Fix SIP connection test and improve logging for SIP Application class

Screenshare sound and lock fixes

HTML5: Adjust guest status body params

 - make text tracks always a json array

Only use chromeExtensionLinkURL if it is set