Heisenbridge

- Accept elliptic curve keys in the CERTFP command (thanks viiru-)
- Include ! in the mode list, fixes weird modes breaking nicks (thanks gsora)
- Add support for away-notify cap, fixes crashes for unexpected AWAY commands
- Bump Mautrix max version to v0.20.x
- Drop Python 3.8 support (because of Mautrix)

- Read default port and listen address from config url (BtbN)
- Improvements to pillifying IRC nicks, again
- Fixes for AUTOQUERY not always working correctly
- Allow anyone to use STATUS command to get their own status
- Filter control characters only for plumbs so people can send garbage to IRC if they wish from Matrix
- Support for converting IRC color codes to Matrix (tjaderxyz)
- Fixed compose docker Synapse configuration for registration
- Improved Python 3.10 compatibliy (BtbN)
- Hidden room to hide joins using restricted rooms join rule (BtbN)

Enabling hidden room functionality additionally requires either re-joining channels or having them already at v9 and using the UPGRADE command.