Refactor Trainer sprites

[fdeblasio]

This PR refactors the code involving Trainer sprites in order to make them easier to add in the future

To add a new trainer sprite, first define the new sprite in include/constants/trainers.h
#define TRAINER_PIC_CUSTOM 95

Next, add the sprite to graphics/trainers/front_pics and then in src/data/graphics/trainers.h, make a variable for the sprite and the palette

const u32 gTrainerFrontPic_Custom[] = INCBIN_U32("graphics/trainers/front_pics/custom.4bpp.lz");
const u32 gTrainerPalette_Custom[] = INCBIN_U32("graphics/trainers/front_pics/custom.gbapal.lz");

Finally, in src/data/graphics/trainers.h, add a new TRAINER_SPRITE to gTrainerSprites using the last parts of the variable names for the TRAINER_PIC and front pic/palette variables

TRAINER_SPRITE(CUSTOM, Custom),

Discord contact info

Frankfurter

[Bassoonian]

Conflicts

[AlexOn1ine]

Could you add a small tutorial in the description on how new trainer sprites can be added?

[fdeblasio]

Could you add a small tutorial in the description on how new trainer sprites can be added?

Done. Let me know if the tutorial can be improved

[fdeblasio]

Conflicts

Conflicts resolved

[AlexOn1ine]

Could you add a small tutorial in the description on how new trainer sprites can be added?

Done. Let me know if the tutorial can be improved

No, it's fine. Thank you!