- Add RPL_ISUPPORT support with CHANMODES, CHANTYPES, PREFIX parsing
- Add support for channel mode state with mode arguments
- Add upstream support for RPL_UMODEIS, RPL_CHANNELMODEIS
- Request channel MODE on upstream channel JOIN
- Use sane default channel mode and channel mode types
We now store SASL credentials in the database and automatically populate
them on NickServ REGISTER/IDENTIFY.
References: https://todo.sr.ht/~emersion/jounce/10