Support svc2 in screen share

Fix recording playback hang in Firefox

Chrome frame has been discontinued for quite a while. The playback code actually
does work in IE if you install an extra codec pack or switch the video format used.

Due to the extra delays added by setting up the closed captions, it happens more
often that the writing.js code will attempt to initialize popcorn on the video
element before the video element actually exists on the page.

(This was always a problem, it's just worse now)

Add a synchronization point which will delay the popcorn initialization until the
video element is ready.

This can create weird conflicts when using other libraries

Updating API demos for 1.1-beta -- removing older demos no longer used

bbb-client-check WebRTCEchoTest:change voiceBridge from "undefined" to ""

Bbb-client-check add missing functions for WebRTCEchoTest

Bumped the copyright date on index.html

 - add svc2 codec lib for macos

Webcams only for moderator

Support svc2 in screen share

HTML5 - Fix Recording Indicator Logic

Original:
The indicator is always visible.
If the meeting is currently being recorded,
Then indicator turns red

Changed to:
If the meeting is currently being recorded
Then the indicator is displayed and red

HTML5 Client userlist - added muted/unmuted button for the current user

Complete emoji icons

New settings update - Application Menu

HTML5 - comment out unimplemented presenter slide control UI