permission calculation
channel group inheritance
general server & channel groups
- assignments
- removement
- temporary groups

Notified channel & server member add/remove powers
Group edit if the notify<server/channel> group triggers

Icon IDs seem to be buggy with groups
group permission copy dosn't work
permission reset

servergroupclientlist

server default group edit
channelgroupclientlist
temporary group/channel assignments
Test with `kCacheAllClients` and without `kCacheAllClients`

TODO:
- Delete the group header