- Adjusted MF_loadsprite() so that it can apply to more objects, such as background particles
- Added MF_loadframe( fixed, filename, animation bank, sprite in levelpack folder y/n, frame (0-indexed) ) for replacing individual frames on object animations
- Added MF_editor_enable( editor status (bool) ); I remembered that the editor must be enabled to access text input dialogue, so with this function you can quickly enable-then-disable the editor code group if you want to input text during gameplay in a mod