Updated map and mapgroup macros to get around an rgbds bug.
Legendary beast locale handling annotated and relabeled.
Added a new constant NUM_ENGINE_FLAGS for use in the EngineFlagAction function. This will make it easier for modders to add or remove engine flags.
Updated macros that rely on the GROUP_, MAP_ constants to use the map macro
Added GROUP_NONE and MAP_NONE for the sake of compatibility with this new scheme
Added new macro elevfloor to simplify the definition of elevators under this new scheme
Annotated the SGB functions in predef/sgb.asm, and some of the map scripts. Renamed several functions in home. Renamed six WRAM addresses corresponding to party icon animations, and renamed several others relative to these.
Trainer data in map scripts is now a macro-defined structure.
Field move functions in main.asm are now nearly completely annotated, with local references.
Trailing white space deleted.
