Fix userlist height if banner is enabled

Handle multi-user whiteboard for solo presenter

Recording: Don't use string interpolation when generating commands for slide conversion

Adjusts the user interface to keep coherence when activating the multi-user
whiteboard while there is only the presenter in the meeting.

Just want to make sure that we don't get any bad filenames sneaking in
and causing havoc.

Recording: Audio processing changes to reduce audio desync

This incorporates only the audio desync related changes from #11626
* Add the aresample filter with async option to fill in timestamp gaps
* Use the libopus decoder for opus audio instead of ffmpeg's builtin
  decoder

This gives the following advantages over the previous code:

* The ffmpeg input filters are loaded from a filter "script" file instead
  of passed on the command line. This fixes some cases of recordings
  failing to process because the ffmpeg command line generated for the
  audio processing exceeded the max command line length limit. (Although
  that only really happens due to BBB bugs...)
* Use absolute positions when trimming audio segments for cuts.
  Previously segments were trimmed to the length of the segment, and the
  results were concatenated. There's some possibility of accumulated
  errors in the segment lengths causing audio desync over time. The new
  code incrementally concatenates the segments, and cuts each segment
  end based on the absolute time since the start of the meeting, to
  avoid error accumulation.

Replaced keepEvents with defaultKeepEvents and meetingKeepEvents

Update and add Polling specs

Fixes chat panel appearing after webcam share/unshare

Escaping user typed poll results

Show unmuted microphone in video

Fix for posJoinMessage as undefined

video-provider: add dynamic video page sizes based on number of users 

[Refactor] Whiteboard individual access

Modified the previous implementation of the whiteboard individual access to remove
multiple Collections dependency on this feature. Multi-user whiteboard is now an
array instead of a boolean value and most of the access control can be synchronized
and handled by akka-apps.

New config called paginationThreshold defines classes of page sizes that depend on the number of participants of a meeting

The rationale is pretty much the same as the cameraQualityThresholds, but the thresholds are users here and the ceilings are the page sizes

Adds parameters check after extractCredentials is used

Prevent sending typed poll empty response

correctly catch bigbluebutton.web.serverURL

fix: create meeting message order precedes group chat message in akka…

I was shown a case just now where `CreateNewPresentationPodEvtMsg` can happen prior to the full add of a meeting. This log line becomes relevant once again

Disabled `'Backend meeting queue had not been initialized'` which was added to pinpoint an issue with handling of meeting create events, but the issue seems to be unrelated (and has not been hit after resolving a memory leak)