Install setuptools for building release packages

Fix media with captions in non-relay mode and strip carriage returns

Update pre-commit repos

Don't listen on all interfaces if empty reg URL

Prevent future surprises with irc library updates

Auto-join bridge rooms on Beeper

Bump max Mautrix version, drop Python 3.8

Add support for AS websockets

Fix container building on armv7l

Remove old fallback and never process plain text body for mentions