* feat: Returns an error on join request with no display name.

When someone tries to join a room with lobby enabled and display name is not set returns an error.

* squash: Fixes handling DISPLAY_NAME_REQUIRED with preJoin disabled.

* squash: Fixes mobile build.

* squash: Move isDisplayNameRequired redux state in lobby and introduces isDisplayNameRequiredError.

* squash: Drops unused isDisplayNameRequired.

This was used on showing prejoin when connection was established on showing prejoin. We no longer establish it at that time, so it is not possible to hit it and act on it.

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

Move styles from SCSS to JSS
Convert class to function component

Fix imports
Convert some files to TS

Fix imports

Remove unused icons
Remove fill none from icons
Rename some icons

* feat(lobby): lobby chat

lobby chat support
knocking participants list updates
knocking participants conditonal checks to show message button
handle lobby chat message events
lobby messages from or to moderators only

Co-authored-by: Fecri Kaan Ulubey <f.kaan93@gmail.com>

* squash: Drop typos.

Co-authored-by: Kusi Musah Hussein <kusimusah@gmail.com>
Co-authored-by: Fecri Kaan Ulubey <f.kaan93@gmail.com>
Co-authored-by: Дамян Минков <damencho@jitsi.org>

* feat(prejoin) move invite to toolbar section

* feat(premeeting) redesign prejoin and lobby screens

* code review changes

* fix prejoin flicker and avatar id

* fix password error message and native lobby dialog close position

* fix(lobby) disable invite from lobby screen fix #9209

* fix(lobby) destructered props fix #9209

* fix(lobby) changed const name fix #9209

* fix(lobby) added empty line fix #9209

display sip address in invites
hide lobby password for sip users
tidy up invite placeholders

The lobby feature adds the possibility to lock a meeting and only allow people in after virtually knocking and going through formal approval