Integrate live streaming inside the jitsi/rtc components.
Live streaming works without jitsi, but is using the same components for
a fluid integration.
A streaming URL can be set in the settings page.
Users EITHER consume the live stream OR are presend in a jitsi live
conference.
To consume both the live stream and the jitsi conference, users may use
a dedicated jitsi tab in their session.
The jitsi users can be restricted to only allow thouse with the right
the manage speakers or being present on the "current list of speakers",
automatically simulating a virtual plenum
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