Fix mobile video dropdown

Fix actions bar height for mobile

Change browser detection library to bowser

Improvements in muted banner

Fix localization of heading in presentation uploader

Fix: making allowModsToUnmuteUsers=true work again

When listen only fallbacks from Kurento to FreeSWITCH, we must guarantee
the muted alert won't be created, speciallly because listen-only's fallback
uses a flow similar to microphone's. Client currently crashes when this
happens: this commit fixes this peoblem.

We now stop the MediaStream (cloned/dummy input stream) when this is not
needed anymore.
We don't create/clone a new MediaStream when it already exists.
Fixed eslint warning in muted-alert/component.jsx

Update and some improvements on PR #10129 - dynamic change audio device 

Different colors for the selected User Response poll button

Revert "Change browser detection library from browser-detect to bowser"

Config overlay for bbb-web turn server config

Change browser detection library from browser-detect to bowser

Enhancements to presentation OfficeToPDF conversion

Rework banned users

Updated release to 2.3.0-beta-2

Enabled by default Shared notes in 2.3

Packaging already replaces `url: ETHERPAD_HOST` so it should be safe to have `note:enabled: true`

Mobile video dropdown size

* WIP adding whiteboard special user access test spec

* Adds additional user whiteboard access test spec to whiteboard.obj.js

Improve guest lobby feedback

Included a message and a redirect for the cases where the guest is
not allowed to join or the meeting has expired/ended.