Enable three parallel KMS servers

audio-manager: shortcut on setSenderTrackEnabled when in listen only

screenshare: make presenter's screenshare preview local instead of remote

Configurable max number of breakout rooms

audio-manager: refactor client-side mute/unmute

Use this wisely: breakoutRoomLimit parameter was introduced to controll max number of breakout rooms.

video-provider: fix mesh stream sorting with multiple cameras

Also some much needed code movearound in Kurento`s bridge

Add individual messages to video disable

Add a client-side microphone mute/unmute

Should increase client-server mute state consistency

The mic mute is done client side via the track`s enabled flag, which generates silent when false. This still tracks the server/freeswitch mute state, so server-side mutes will be reproduced in the client

Pulled HTML5 locales Sept 9, 2020

Meeting end callback url

Fix banned users log

Normalize custom parameters

Merge branch 'v2.2.x-release' of github.com:bigbluebutton/bigbluebutton into meeting-end-callback-url

 - add meetingEndedURL and endWhenNoModerator create param
 - meetingEndedURL is complete
 - endWhenNoModerator is partially implemented. Will be continued in another PR.

Prevent non presenters to start/stop an external video

Add check when start/stop an external video

Co-authored-by: Anton Georgiev <antobinary@users.noreply.github.com>