feat(a11y): make (most) UI elements reachable via keyboard

Convert some files to TS
Move some styles from SCSS to JSS
Update design

* tss-react doesn't need a type anotation for the Theme

* Update tss-react to 4.4.4

Remove unused icons
Remove fill none from icons
Rename some icons

Fixes issue where Label styles would take precedence over parent styles (raised hand counter would be gray instead of yellow)

Use new TS config from @jitsi/eslint
Fix all lint errors

Remove unnecessary ts-ignores
Change any to actual types
Fix eslint rule

Convert files that use material-ui to TS (needed for material-ui upgrade)

Updated animations
Added raised hands counter
Added max width to title bar

Video quality label now becomes "performance settings".
All CSS for labels is moved to JS.
Overflow menu button is also changed to "performance settings".