Add util functions to compress and uncompress strings.
Fixed a couple of modules so they use SceneCommunicationService rather than directly call functions on the CommsManager.
* Friend status updates are still only local, so you still won't know before instant messaging someone if they're online.
* The server each user is on and the user server must be updated or the instant message won't get to the destination.
* Each module directory is currently inside one of the following category folders: Agent (Anything relating to do with Client<->Server communications.), Avatar (Anything to do with the avatar or presence inworld), Framework (Classes modules can use), Grid (Grid traffic, new OGS2 grid comms), Scripting (Scripting functions, etc), World (The enrivonment/scene, IE Sun/Tree modules.)
* This should be moved into a seperate project file.