* Remove pointless custom headers, fall back to ModalHeader instead.

* Enforce fixed column number at various width breakpoints.
* Bring back the filmstrip at small sizes but hide it.
* Change default maximum columns to 7.

Features flags added:  
-tile-view.enabled
-filmstrip.enabled
-notifications.enabled
-toolbox.enabled

* Implement opening toolbar and participant overflows as drawers when below certain width.
* Fix dial-in copy button displaying incorrectly.

feat(external_api) exposes more events from JS to native and adds the ability to send actions from native to JS.

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

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

Fixes: https://github.com/jitsi/jitsi-meet/issues/8307

* Fix toolbox buttons not displaying properly when chat is open.
* Open chat in fullscreen dialog past custom thresholds when mobile/desktop toolbox would become unusable due to chat
* Remove mobile chat check when displaying toolbox

- allow managing chat through API when chat button is not present on UI

It appears that at the time of this writing, creating audio tracks blocks
the browser's main thread for a long time on safari. Wasn't able to confirm
which part of track creation does the blocking exactly, but not creating
the tracks seems to help and makes the UI much more responsive.

* Show recording started notification to the initiator

* Translate 'recording.on' language key for English and Turkish
Translate 'liveStreaming.on' language key for English and Turkish

Canvas rendering does not work as expected on Safari - the image stays
still on the first frame. Calling play() on the video tags seems to help.

Fill must be properly specified.

* Expose raise hand event to external application

* Fix linting issues

* fix the app non existing issue

We were not processing properties which are set (fire properties updated) before the conference joined event is fired.