Alternate biome transitions

This datapack adds transitions between biomes (small blobs of each extend into the other) to break up the harsh transitions between some biomes. See the gallery for images of what this looks like. This datapack also makes colder biomes generate further out higher up to make mountain transition more realistic.

Because this datapack makes colder biomes generate higher up, the `/locate` command may find biomes up in the sky (i.e a plains 400 blocks above a savanna). This is especially common when increasing the height of a world. To counteract this, you should try to find the biome in an unmodified world. The same biome should be there in the world with this datapack (though sometimes there could be a closer one, if one almost generated, this datapack may generate a transition to it).