Add BiomeTextureType [Feature Request #128]

[Cristelknight]

A friend of mine really wanted this Optifine feature for Fabric. But apparently there wasn't an alternative yet, and this mod came closest to it. Since the feature had been requested several times and it seemed easy to add a new texture type (this is basically a copy of the RandomTextureType), I went ahead and did it.

Example MCMETA file:
stone.png.mcmeta

{
  "fusion": {
    "type": "biome",
    "rows": 2,
    "columns": 2,
    "default": 0,
    "biomes": {
      "minecraft:plains": 0,
      "minecraft:forest": 1,
      "minecraft:river": [0, 1],
      "minecraft:savanna": [1, 1]
    }
  }
}

It works as you can see here:
Oak Leaves to -> Acacia/Birch Leaves in Forest/Plains biome

Stone to -> random other textures in various biomes:

But I've also noticed that lines between some blocks can appear, and I'm not sure if it's my fault or the mod's. So I could use some help here (hard to see if not zoomed in):

I'm not sure what the guidelines are here for pull requests, and I rarely create some in general, but I hope this is okay.

[Cristelknight]

I just noticed Polytone exists 😭