feat(electron): basic Electron SS support

Add karma and jasmine unit testing to lib-jitsi-meet.  also add a ver…

feat: Allows to disable the suspend video

PC constrain via configuration.

Add SERVER_ERROR to JitsiConnectionErrors

JitsiConnectionEvents.CONNECTION_FAILED with SERVER_ERROR will be
emitted when the XMPP connection is closed due too many 5xx HTTP errors.

Log collector

Minor fixes in moderator.js

Match reported remote userId to other cs calls.

feat(Analytics): Multiple analytics handlers support

Connection problems indication stalled when video muted

Simplifies the main condition as suggested by H. Terezov

Fixes an issue where the user would end up stuck in disconnected if
the video muted signalling arrived after the timeout. Also reactors
the way how the output status is figured out.

Suspend video

Fixes instanceof JitsiTrackError

Suspend LocalStatsCollector#AudioContext if not used.

Suspended detection

Fixes calling of leave in kick.

Currently if RTCPeerConnection is closed (an event is delivered) and we haven't called close method ourselves, this means browser has closed it due to suspending the PC.

Set the FPS constraints only when video has been requested

Adds a getParticipantCount function, cleanup.