Changes compared to previous version (v0.18-b3):
- Added very basic display of announcements (just so that they can be seen at all)
- Added View menu entry to toggle userlist and changed default hotkey
- Added setting to open Connect Dialog when no login data or channel is provided, even if it otherwise wouldn't
- Fixed error sometimes occuring when moving mouse over channel when closing window
- Fixed PubSub messages very rarely reopening a closed channel