Merge branch 'breakout-room-closing-warning' of https://github.com/capilkey/bigbluebutton into capilkey-breakout-room-closing-warning

Change ejected msg

 - implement muteOnstart by passing on create API or using bigbluebut…

 - implement muteOnstart by passing on create API or using bigbluebutton.properties in bbb-web instead of setting it in config.xml

This should prevent blank webcams on the flash client

 - allow to pass custom copyright text using create API

 - allow passing of custom param (logo) to override default logo

Conflicts:
	bigbluebutton-html5/imports/ui/components/video-dock/component.jsx

Conflicts:
	bigbluebutton-html5/imports/ui/components/video-dock/component.jsx
	labs/bbb-webrtc-sfu/lib/video/VideoManager.js
	labs/bbb-webrtc-sfu/lib/video/video.js

This should solve the most severe cases of ghost webcams

 - hardcode logoutTimer to zero as we don't use this feature in the r…

 - fix issue https://github.com/bigbluebutton/bigbluebutton/issues/4660

 - substitute keyworks in moderatorOnlyMessage

Improvements on Presentation Management

Hide audio labels

Fixed round buttons' icon centering

Fixes #3576