* Updated GStreamer to 1.20
* Updated libnice to 0.1.18
* Vendored a minimal set of modified xmpp-parsers elements rather than
the whole thing
* Implemented retries of the initial Colibri connection
* Updated deps
In small deployments, for instance when there is only one server for all
participants, the region doesn’t mean anything so we can remove the
elements instead of sending an empty value.
* Allow focus to be a bare or full JID (thanks @teowoz & @Tellyo)
* If extdisco fails, just continue without STUN/TURN (thanks @teowoz &
@Tellyo)
* Updated deps for new colibri protocol crate
* rustfmt