ChatModule is now only doing in-world chat. IRCBridgeModule is only doing, well,
bridging chat to/from IRC. Both modules are now using a new OnChatFromWorld event
handler (which Scene.PacketHandler is feeding for chat from in-world instead of
going via the Interface method). This refactoring will allow us to easily add
other bridge modules (e.g., an XMPP bridge module).
there is still a bug in IRCBridgeModule (inherited from the old ChatModule)
where FindClientRegion does not really find the client region...
* Concurrency issues are resolved because each object makes a memory-only copy of itself and backs up the copy.
* Because of the way this is done, the latest at the time of the backup gets backed up (no functionality change)
* You can move *thousands of objects at a time* and the sim doesn't freeze and wait for the backup to complete.
* This can be enhanced more by dedicating the thread as opposed to starting it when the backup process starts.
mingchen