- Make an empty message type optional mean "no message"
- Set message type for all actions that send a message through the normal mechanism
- Remove now redundant bool specifying whether a message should be sent
Move the fucntionality of ActionsHandler into ChatbarCache and ActionsModel.
At this stage there wasn't much left that is was doing and the functionality could easily move.
Move the functionality to cache the contents of a chat bar from the room directly and to a new ChatCache object. This works pretty much the same with a few extra check and balances, this also made it easy to put a test suite around the functionality so I did. The current functionality should be identical to what exists.
This is in prep for threads which will require managing even more caches if we create one per thread.
