Decompile pl_batt_obj NARC, document related battle_icon.c

[joshua-smith-12]

• Decompile pl_batt_obj.narc
• Implement Python scripts to build the NARC
• Rename unk_0207C908 -> battle_icon and document (some) fields

TODO:

• update any unfixed PNG files from this NARC with the correct width + palette

this is my first contribution, tried my best to keep it to a similar style as the rest of the code but I probably scuffed it a little :)

[joshua-smith-12]

Started looking at NCER/NANR, will require a couple nitrogfx changes which I will note here

https://github.com/red031000/nitrogfx/pull/11 https://github.com/red031000/nitrogfx/pull/12 https://github.com/red031000/nitrogfx/pull/14