feat(a11y): Globally improve accessibility for screen reader users

* 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

Convert some files to TS

* fix(ts,connection) avoid mixing web and native code

* chore(ts) split config

The mobile part is still WIP.

* Remove default tsconfig

* Fix ts-loader - use web tsconfig

* Fix tsconfig

Use noEmit only on npm scripts (for type checking), but don't use it in webpack

* Fix

* Fix import

* Fix

Co-authored-by: Saúl Ibarra Corretgé <saghul@jitsi.org>

Convert PreMeetingScreen to TS and transform it to function component

The copyText wrapper is used in the `showStartedRecordingNotification`
action, which is common for web and native. Provide a native
implementation so the right one is bundled.

It gets bundled on mobile for no reason otherwise.

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)

- apply theming to various buttons

* Make Jitsi WCAG 2.1 compliant

* Fixed password form keypress handling

* Added keypress handler to name form

* Removed unneccessary dom query

* Fixed mouse hove style

* Removed obsolete css rules

* accessibilty background feature

* Merge remote-tracking branch 'upstream/master' into nic/fix/merge-conflicts

* fix error

* add german translation

* Fixed merge issue

* Add id prop back to device selection

* Fixed lockfile

Co-authored-by: AHMAD KADRI <52747422+ahmadkadri@users.noreply.github.com>