Renamed `title` to `movies`. Moved some functions from `engine/routines/` to their fitting directories, and cleaned up the base `engine/` directory. Moved `engine/pokemon/tmhm.asm` back to `engine/items/`. Made a new subdirectory: * engine/tilesets: Contains all map-related graphics routines.
Handle edge cases first.
engine/routines/ stores isolated out-of-context routines as individual files. It might be preferable later to append them to their related engine/ files in unique little SECTIONs, relying on the linkerscript to place them appropriately; or some other organization method. In the meantime, they're now easily findable apart from main.asm's other content.