Lots of changes

* Added raid healing done, received, damage taken overlays
* Added healing done, avg. hps overlays
* /jointest now checks version. Send version and handle error messages
* SWAP main frame and overlays now double buffered to reduce flickering
* Overlay dividers now work with categories
* Overlay position and sizes are now stored in an integer instead of a
tuple
* Raid updates no longer print damage info
* Version set to 0.1a