- make irc erros in backend directed

- add tcp keep alive to Net::IRC3?

- make /presence command (for IRC it toggles just away status)
- 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)