* feat(tile-view): initial implementation for mobile
- Create a tile view component for displaying thumbnails in a
two-dimensional grid.
- Update the existing TileViewButton so it shows a label in the
overflow menu.
- Modify conference so it can display TileView while hiding
Filmstrip.
- Modify Thumbnail so its width/height can be set and to prevent
pinning while in tile view mode.
* use style array for thumbnail styles
* change ternary to math.min for expressiveness
* use dimensiondetector
* pass explicit disableTint prop
* use makeAspectRatioAware instead of aspectRatio prop
* update docs
* fix docs again (fix laziest copy/paste job I've ever done)
* large-video: rename onPress prop to onClick
* change forEach to for...of
* use truthy check fallthrough logic instead of explicit if
* put tile view button second to last in menu
* move spacer to a constant
* the magical incantation to make flow shut up