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.