Chromium 91 and later uses "AV1" instead of "AV1X".  Simulcast is
still broken.

Show the "hand-paper" symbol instead of the "circle" symbol while a
user is raising their hand.

(*webClient).action may be called with the group mutex taken,
and therefore cannot take the client mutex.

This prevents simulcast from being switched on when we enable
recording.

We now request a keyframe if we lose too many packets.

This version fixes issues with out-of-order packets.

This avoids a crash when a single frame was too large for the
samplebuilder.

Fix small typo

This makes for better error messages.

Consult the description directly.

It used to be delegated to clients.

We used to omit the slash, which users found confusing.