Video tile redesign/refactor

[robintown]

Depends on element-hq/compound-web#110

Closes #1764
Fixes one half of #1839 (local video is now mirrored correctly in the call view, but not in the lobby)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (ec06c84) 25.02% compared to head (1865ccb) 25.02%.
Report is 4 commits behind head on livekit.

Additional details and impacted files

@@           Coverage Diff            @@
##           livekit    #1989   +/-   ##
========================================
  Coverage    25.02%   25.02%           
========================================
  Files           48       47    -1     
  Lines         2394     2382   -12     
  Branches       438      434    -4     
========================================
- Hits           599      596    -3     
+ Misses        1744     1735    -9     
  Partials        51       51           

Flag	Coverage Δ
unittests	25.02% <100.00%> (+<0.01%)	⬆️

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[toger5]

Thanks.
This is super satisfying to see how this also makes it a lot more readable (+ better to test)
Most of the code also was very striaght forward to review.

Playing around with it I found the following, is this intentional?

• The user tile ("you") cannot be moved into the first position grid mode.

I will give this a approval since I am on holiday but before merging I think the "cannot be moved into the first position" should addressed (exept its by design. If so I would be curious why) and the TODO (move to vm in case that is easy enough for this PR)

[robintown]

The user tile ("you") cannot be moved into the first position grid mode.

Ah right, I've seen this happening in the application for some months, so I don't believe it's a regression introduced here. The plan for fixing this is that, the new grid layouts won't allow for dragging and dropping anyways, so I'd like to move ahead with implementing them.