* feat(notifications) trigger iframe api event when a notification occurs

* remove useless comment

* fix typo

* 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 local recording saving not working after IFrame sanbox introduciton. The allow-downloads flag was missing.

Ref: https://github.com/jitsi/jitsi-meet-electron/issues/837

These are used by the Electron app to open links in the chat, for
example.

Make sure the ifrme is fully configured before setting the source URL
and thus triggering the load.

Give it the minimum amount of permissions necessary to run.

* ref(misc) remove unused code for dock / undock

* remove translations

* report pc connection failure

* typos

* code review / update rtcstats

* check for undefined APP

Add the ability to specify video type when in multistream mode.

* add toggle noise-suppression API

* switch NS API from toggle to set

* feat(external-api) Add command to show custom in-meeting notification

* fix lint

* added uid to showNotifications, added hideNotifications

Found via `codespell -q 3 -S ./lang -L miliseconds`

* fix: When adding a room param to urls check for previous params.

* squash: Uses URL object to modify the url.

* squash: Use common connection options from base/connection.

Normalizes bosh url and for web.

* squash: Adds release param to external api and handles it.

* feat: Adds release handling for mobile(links in welcome page).

* squash: Fixes comments.

* feat(external-api): add toggle subtitles command

* feat(external-api): add set subtitles command

- jwt from API overwrites any jwt sent as queryparam
- `defaultLanguage` from configOverwrite converts to `lang` query param

* feat(external-api): add local subject command

* add to whitelist

* apply config value

- Set region along shard from xmpp

Renamed event property

Signals that the bridge channel is open. It may take a few ms to get established
after the conference join, so applications might be interested in using it once
ready.

- EventEmmitter treats 'error' as a special case and throws error.

* add button state / helper dialog

* new audio screen share flow

* change error message

* address a couple of merge conflicts

* fix lint

* address code review

* address code review

* restrict audio screen share on mobile browsers