Since plan-b mode will no longer be supported, check for unified plan support is not needed anymore.

Gets rid of an unwanted error that gets printed in the log when there are orphan tracks.

There are cases when participant is left and still we receive a track added. In this occasions for screensharing sources a virtual participant is created for non-existing participant.

Use a fixed set of remote tracks for a call based on the ssrc-limit set in jvb config. When this feature is enabled, JVB will signal the audio and video SSRCs and their owner/endpoint info using a bridge channel message. For audio, the mappings are determined based on the energy rankings on the audio sources present in the call and for video, the mappings are calculated based on the video sources the client requests through the video receiver constraints.
Remote tracks are then created/remapped by the client based on these mappings.

* Added track_owner_changed action
* Skip track-based large-video selection in rewriting mode.
* Register OWNER_CHANGED handler at track level.
* feat(participants) Add source info to participants in redux.
With ssrc-rewriting, the receiver constraints need to be generated using the source info received in presence. Currently they are generated from the track info in redux but with ssrc-rewriting, remote sources are not signaled and therefore created until they are being requested through receiver constraints.

Co-authored-by: James A <jqdrqgnq@users.noreply.github.com>

state['features/base/conference'].conference is not the right way to get the current conference.
See getCurrentConference selector - it accounts for joining and other states.

* fix(connection-status): remove unused participant connectionStatus.
Always use trackStreamingStatus now that legacy endpoint based signaling has been removed.

* remove the check for source-name signaling.
Default to source-name signaling always.

* Remove the check for multi-stream mode.
Make that the default mode and remove the support for legacy SS mode.

* Remove presenter mode.

* update latest@lib-jitsi-meet

Mobile does not do multiple local video streams for performance reasons,
so avoid creating the local fake participant.

WIP

Add a second virtual SS tile on RN when a remote participant that has multi-stream mode enabled starts a screenshare.

* fix(multi-stream) update selector to find ss track by videoType or mediaType

* ref(multi-stream) move fake ss creation logic and support video type changed

* refactor(multi-stream) decouple sending and receiving multiple screenshare streams

* fix(multi-stream) fix receiver constraints with signaling and without multi-stream

* fix(mutli-stream) ensure plan b original SS thumbnail displays avatar

* fix(multi-stream) show fake SS for plan b sender

* refactor(multi-stream) poc for moving SS creation to state listener

* remove reference to fake SS creation

* fix lint errors

* rename to virtual screenshare participants

* fix minor bugs

* rename participant subscriber to specify web support only