Rotation and Anchor Points Test (SGDK)

Added code to apply rotations to points on the rotating background layer. This allows hitboxes and sprites to move with the background as it rotates. Rotation values are pre-calculated and the speed is pretty good. I'll need to try adding the second rotating ship. Graphics mostly made with Pro Motion NG 7.2.8.0 (explosions generated w/ Blender) Code written with SGDK 1.80 Sega Genesis emulation using BlastEm 0.6.2 A slightly newer version of this code is up at GitHub https://github.com/radioation/SGDKRoc...