Adds visual regression testing

Add ClientConnection manager

Update Jest ^23.5.0 > ^26.6.1

Bbb conf libreoffice

Move the check to disable mutedAlert feature; temp disable it

[Mobile] - Setting or clearing user status locks the whole screen

Removed traces of red5 apps, flash client, etc from bigbluebutton-config/

Fix for OSX and iOS Safari errors in console

On mobile if you clicked on a user or your own user to set their status, the tethered modal would keep it's z-index, which would prevent the user from interacting with anything because the tethered modal would overlap the whole site.

Update stun

Removed obsolete BBB components from 2.3

Merge 2.2.27 and 2.2.28 in 'develop'

Improve annotations and cursor streamer logs

Improve annotations and cursor streamer logs, also add a type info for some logs in authentication process
and rollback some attempts to fix multiple leaving end call.

Better handling audio reconnection

When getting disconnected with 1001 ("websocket closed unexpectedly" error) we were creating a new SIP session, therefore a new FreeSWITCH channel.
While reconnecting the socket, instead of closing the SIP session, we keep it alive during reconnection (audio should keep working in the meantime). When reconnected we keep using this same session (avoiding the creation of an extra one).
We also better handle WebSocket error codes from SIP.js.
FF immediately closes websocket when unloading page, so we now to stop user agent when 'beforeunload' event is triggered, to avoid leaving open sessions in FreeSWITCH when user leaves page.

The component expects a boolean but isIphone property return an array ["Iphone"] if the user is from an iPhone

They both return an array with ["Iphone"] if you're from an iphone but the component expects bool variables.

Fix wrong skipCheck handling

We now let sip.js handle getUserMedia calls, same should happen when skipCheck is active.
Solves #10652.