Introduces a new feature flag ('help.enabled') and uses that to
determine the visibility of the 'Help' button in a call.

Fixes: https://github.com/jitsi/jitsi-meet/issues/8510

This basically reverts
a3fb996ff0
while retaining the same properties that prompted it's original intent, namely
avoiding sending the Referrer header.

* feat(conference): Enable forced reload of client on bridge failure.
Force the client to reload when the bridge that is handling the media goes down.
This mitigates issues seen on the bridge because of a client re-joining the call with the same endpointId, BWE issues, etc.
This behavior is configurable through 'enableForcedReload' setting in config.js.
The client skips the pre-join page when the page reloads.

* squash: refactor the restart logic.

* squash: fix description

* squash: dispatch conferenceWillLeave action before reload.

* feat: add ipados list of Platform.OS

* Create generic tooltip wrapper for mobile usability.
* Change overflow menu icon/font/padding sizes.
* Change overflow drawer expand icon.

* send meeting uuid to rtcstats

* change ret description

* fix flow error

* update lib-jitsi-meet version

* 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>