Overgrowth alpha 43

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!

On the coding front, here are a few highlights from the source repository:

- Fixed decal shadow updating - Added decal frustum culling - Improved plant rendering - Various UI updates - Bug fixes

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