- make subid listing sort case insensitive
- make subscribe jump to the destination buffer
- make undirected infos and errors temporary (and static on 'status')
- make irc erros in backend directed

- make toggle-sets for certain buffers (which are shared globally but
   selected locally)

- improve irc mode setting and general any channel actions
  - make irc invites being displayed etc.
- add XMPP support with Net::XMPP2 (which still isn't released)
- add authorisation to backend (digest md5 auth of some kind?)
- allow correct display of multi-line messages

future:
- implement formatted messages (for wrap-padding and colors)