Overgrowth alpha 52

Here is what is new in Overgrowth in this weekly alpha. If you are confused what a weekly alpha is, or even what Overgrowth is, please read our fancy FAQ. Basically, we are developing a massive video game from the ground up -- we are able to do this completely independently by accepting preorders for the game before it's done!

Here are a few highlights from the source repository:

- Redid undo/redo system
- Cleaned up code a lot
- Alt-R to summon ragdolls
- Improved decal updating
- Added ribbon flashing for keyboard shortcuts
- UI doesn't consume keypresses when ctrl is held
- Lots of refactoring
- Bug fixes

Thanks as always for all the support! See you guys in IRC and the forums.