0.002 release

Actual editor-related functionality- creating tilesets and editing individual tiles, with a large slew of paint functionality. The unmarked textbox is alpha blend- set to 50 for drawing to be at 50%, for example.

A few more tools and bits of functionality and a lot of UI cleanup awaits (the alpha blend, for example, will become a slider; lots of other changes on the tool panel; windows should open at more appropriate sizes; some options need to be remembered; etc)