Remove predefined directories (like biomes ores carvers etc.), and replace them with a type key in all configs. This has the advantage of allowing more freedom when organizing config packs, for example:

pack
  desert
    palettes 
      desert_palette.yml # type: PALETTE
      mesa_palette.yml # type: PALETTE
    biomes
      desert_biome.yml # type: BIOME
      mesa_biome.yml # type: BIOME

This would go hand in hand with #108, since it would allow noise configs to be placed wherever, either in their own folder, or next to the biomes that use them, wherever the pack developer thinks it makes most sense.

Implemented with #118