Enhancement: Adobe Animate Texture Atlas / Spritemap support

Adobe animate spritemaps are a way to save memory and space over the regular spritesheet format and simultaneously store longer animations with no issue. Instead of having an entire graphic for every frame, it generates all the individual pieces that you can assemble using the two generated JSONs: one that stores animation data (rotation, scaling, positioning, the works) and one that stores the positions of the pieces on the spritemaps. I doubt this would be easy or even feasible to implement, but it would be very, very useful.

The issue names no files, tests, or entry points. Start by documenting Adobe Animate's two generated JSON formats and locating the engine's existing spritesheet or animation-loading paths; done means Adobe Animate spritemaps can be loaded and used for longer animations without requiring a separate full graphic for every frame.