Implement error-subcodes as in icbm
Implement transaction-support for rosters

Finish TLV-Set for Rendezvous
Finish TLV-Set for NickInfo

Add support for SNAC-Family 0x0022
Add support for VCard-retrival
Try to handle away-messages
Add roster-retrival and editor
Filetransfers?
Groupchats?
BuddyIcons?
Typing notifications
account registration, password-changes
account validation (valid ICQ# etc)