rows=4
columns=4

[00][01][02][03]
[04][05][06][07]
[08][09][10][11]
[12][13][14][15]

north=0,1,2,3
south=12,13,14,15
west=4,5,6,7
east=8,9,10,11

# Grayscale variants: every source sheet has a -grayscale sibling (e.g. 001-b-n-grayscale.png)
# with identical dimensions/layout. The mapping files (followsprites_mapping.json,
# pokedex_mapping/, swimming/levitates_sprite_mapping.json) point normal and shiny
# entries at the -grayscale art for all PaletteFX modes except redpp (ADVANCED), which
# uses the original colored art via the grayscaleFile/grayscalePath (grayscaleTarget) fields.
