feat: Add something like loadPalette() which loads .gpl

[amyspark-ng]

Suggedted by @lajbel, please elaborate 😔

Wrote by @lajbel:

loadPalette("mulfok32", "./palettes/mulfok32.gpl");

const mulfok = getPalette("mulfok32");

mulfok[0]; // the first element in the palette

// how mulfok would like
mulfok = [
    new Color(...),
    new Color(...),
]

This could be cool for users loading a palette and the colors objects being created once.
We use .gpl files like Aseprite

[dragoncoder047]

This might go nice with a palletize shader that gets a uniform vec4 u_palette[PALLETE_SIZE]; and then makes it the closest color, for stuff that has like continuous colors gradients. it would get banding but if the goal is the palette then well, priorities