Skeletal animation data

Super tiny update: added the skeletal animation source files, because I forgot them when doing the source file uploads yesterday. You don't strictly need them since all the data is defined in skelani_init_all_keyframes, but it could be useful if you want to change some of the default animations just a little bit.

(To change the data of an animation keyframe: once you're satisfied with the pose, don't forget to update skelani_init_all_keyframes - there's a hotkey in the animation editor to copy a pre-formatted code snippet to the clipboard for this purpose)