Move all sheets to render in a new container which uses FullWindowOverlay, which allows rendering above presentation controllers on iOS.

I somehow missed all other usages of the ColorSchemeRegistry.

* no ssrc when sourceNameSignalingEnabled
* conditionally use source name for stats
* update doc
* always subscribe to participant id

- Fixed background color for all participants context menus
- Removed connection status from ReactVideoMenu and added it for local participants
- Removed AVModeration comments on mobile
- Show on stage option visible only when participants pane is closed

Found via `codespell -q 3 -S ./lang`