Fixes #15464
Fixes #15465

Fixes the issue with adding duplicate elements in buttonsWithNotifyClick and participantMenuButtonsWithNotifyClick with custom buttons.

Filters the toolbarButtons in redux depending on the visitor state instead of filtering them every time in mapStateToProps. This will prevent unnecessary rerenders of the toolbar.

Additionally:
 - Moves visitor buttons const from features/config in features/toolbox.
 - Removes dublicate functions isButtonEnabled and isToolbarButtonEnabled.
 - Adds more buttons to the visitor allowed buttons which functionality has been any way accessible trough shortcuts or somewhere else.
 - Enables customButtons to be visible for visitors.

The previous version of getToolbarButtons function was actually adding the custom buttons on every call to the config toolbarButtons array, effectively creating dublicates of every custom button. The PR fixes this issue.

Also now we will be running the getToolbarButtons calculation only when needed.

Offer the default app, but make it configurable for own branded
desktop clients

Signed-off-by: Christoph Settgast <csett86_git@quicksands.de>

As we have the jitsi-meet-electron app, lets allow deployments to use it.

Allow deployments to enable desktop deeplinking without the need to re-implement _openDesktopApp()
Disable it by default to keep the current behaviour (deeplinking on mobile on, on desktop off)

This feature is meant as purely opt-in.

Signed-off-by: Christoph Settgast <csett86_git@quicksands.de>

* fix(mobile) Do not disableAudioLevels on RN since it uses feature detection now.
Local and remote audio levels will automatically be disabled on RN since receiver stats and local audio stats are not supported there.

* add custom remote menu button

* add config for custom buttons

* whitelist custom buttons flag

* add toolbox custom button

* fix notify toolbox buttons

* whitelist toolbar custom buttons

* rename and fix notify

* rename participant remote menu

* revert some flag wrong changes

* fix some formatings

* add undefined type to custom buttons toolbox

* code review

* code review 2

* fix linting issue

* fix(participants): Change from array to Map

* fix(unload): optimise

* feat: Introduces new states for e2ee feature.

Stores everyoneSupportsE2EE and everyoneEnabledE2EE to minimize looping through participants list.

squash: Uses participants map and go over the elements only once.

* feat: Optimizes isEveryoneModerator to do less frequent checks in all participants.

* fix: Drops deep equal from participants pane and uses the map.

* fix(SharedVideo): isVideoPlaying

* fix(participants): Optimise isEveryoneModerator

* fix(e2e): Optimise everyoneEnabledE2EE

* fix: JS errors.

* ref(participants): remove getParticipants

* fix(participants): Prepare for PR.

* fix: Changes participants pane to be component.

The functional component was always rendered:
`prev props: {} !== {} :next props`.

* feat: Optimization to skip participants list on pane closed.

* fix: The participants list shows and the local participant.

* fix: Fix wrong action name for av-moderation.

* fix: Minimizes the number of render calls of av moderation notification.

* fix: Fix iterating over remote participants.

* fix: Fixes lint error.

* fix: Reflects participant updates for av-moderation.

* fix(ParticipantPane): to work with IDs.

* fix(av-moderation): on PARTCIPANT_UPDATE

* fix(ParticipantPane): close delay.

* fix: address code review comments

* fix(API): mute-everyone

* fix: bugs

* fix(Thumbnail): on mobile.

* fix(ParticipantPane): Close context menu on click.

* fix: Handles few error when local participant is undefined.

* feat: Hides AV moderation if not supported.

* fix: Show mute all video.

* fix: Fixes updating participant for av moderation.

Co-authored-by: damencho <damencho@jitsi.org>

A libre build will exclude the following:

- Analytics modules
- Google Play services GMS
- Crashlytics
- Firebase