Adds functionality for custom oam shapes

[Retnuhytnuob]

Description

Adds support for a .json defined 'oam shape configuration file' to the gbagfx tool.
new parameter to the tool is -oamshape {definition}.json

Dumps, names: gUnknown_084A11EC (groudon stage boulders)

Redumps/simplifies:

• Groudon intro boulders, crystals, head segments
• Ruby intro linoone, sharpedo

---

json file for the oamShapes needs:

• "kind": "oam-shape"
• "pngsize": "{W}x{H}"
• a list of pieces:
  • "pos": "{x},{y}"
  • "size": "{W}x{H}"
  • "spacer": bool (default:false) (needed to specify space to ignore when reading from the png file back into the 4bpp file)

Pieces that it picks up need to be in the order they appear in the source tileset, and must match actual oam shape sizes.
Reminder: valid shape sizes are: squares: 1x1, 2x2, 4x4, 8x8, horizontals: 1x2, 1x4, 2x4, 4x8, verticals: 2x1, 4x1, 4x2, 8x4

Pieces that are flagged as spacer can technically appear in any position/size in the json definition. (examples here have them in order from left to right, top to bottom, mixed with the oam pieces. - If we want to change that so that the spacers are all at the end, that will work as well)

When converting from a 4bpp file to a png file using a oamshape definition, the 'spacer' tiles are given a checkered pattern, to make them stand out as ignored space, which will be helpful if we ever get to a point of moding the game.

Discord username

retnuhytnuob