Meet: Improvements using participant tiles (#273)

* Adds remote track mute event tests for mic and cam

* Tile system with placeholders seem to work

* Placeholder image works

* Placeholder from resources

* Tiles are now prefabs with identity text

* Meet looks much better now, has mic muted displaying as well

* Prioritizes front facing cameras

* Improved placeholder image, mic sync on preexisting tracks is now robust

* Refactored so UI is its own script and camera stuff is its own script

* Moved stuff into utils/video folder

* Camera permission is only triggered on camera open

* Delays camera icon switch after permission, but I still see it flip on permission denied

* Front facing camera rotation works on iOS now, but code looks very overengineered

* Removing some state logic for rotation problem

* Local participant tile is always moved to the top of the layout when created

* Added one comment

Author: MaxHeimbrock

Samples~/Meet/Assets/Prefabs.meta

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