Overgrowth alpha 51

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:

- Mousewheel twist controls for animation editor - Better forward kinematics - Animation editor resize - Pose flip command (ctrl-x) - Hooked up alt-drag keyframe copy - Animation saving/loading - Escape key exits rabbot mode - More work on undo/redo - Rearranged ribbon - Neat new main menu - Cleaned up and added some levels - Implemented masks for UI windows - Double clicking places keyframes - Alt-drag to duplicate keyframes - Initial UI resizing - Fixed ribbon toggles - Bug fixes

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