Do not access JitsiConference's eventEmitter, the functionality of
interest is publicly available through other methods.

JitsiConference passed in the constructor and adding all events happen inside the feature.

As I see no hidden meaning in the current non-preservation of
alphabetical order, I prefer to facilitate scanning (in the fashion of
searching in a dictionary).

Participant connection status tune up and extra logging

By default talk while muted detection is disabled.

Fires event only once when the user is muted, if he unmutes and then mutes back again a new event will be fired if local talking is detected.

Fires CONFERENCE_LEFT event once we receive our presence unavailable.

When we receive kick presence it is both 110 and 307 status code, so we were triggering both conference_left and kicked event. Now when we receive kick we process as it is 110 to clean participants and room and then fire the kick event.

When only one participant is in the room and leaves(hangups) the only participant in members is focus.

Extra logging

When ICE disconnects, reconnects or fails the events will be logged
on both Callstats and "analytics".

When 1 seconds was used it seemed to be overreactive.

The timeout will be configurable though
'peerDisconnectedThroughRtcTimeout' conference config option. It has
not been document in the public API on purpose.

Not allowed error

Adds participant connection status notifications

Skips passing presence, cause it can reach the UI and there was a bug where we tried to pass the presence as an argument to the translation and ended in endless loop.

Updates callstats link by default to use websockets.

Remove FIXME for CallStats not reporting restarted calls

The problem described by the FIXME has been fixed by CallStats.

'onmute'/'onunmute' event of MediaStreamTrack can be used to detect that
the remote user is having connectivity issues, because no video data is
received. We check if those are in sync with the signalling and if not
trigger connection interrupted updates with small delay.

Add "onmute" and "onmute" handlers to the WebRTC MediaStream and trigger
corresponding RTCEvents.

The event is triggered when the notification about the user's connection
status change arrives from the JVB.

fix(RTC): Use import instead of require for JitsiTrackError

Sends non cached values only if datachannel is open.