Add support for Natural Textures

[Kynake]

NaturalTextures is not one of the features originally included in MCPatcher (though it is often conflated as one), but I heard that NotFine plans to remove it's resource pack features in the future, so I think this might be as good a place as any to add support for this.

If you feel that this feature is not a good fit for the mod then that's fine too, as I can convert this into a separate mod with a little extra work.

Pictures, with the feature off and on:

Best way to test this is to open up a dev instance on this branch and add the following resourcepack:
NaturalTextures.zip
This should toggle the rotation of grass and stone textures when enabling / disabling the Modules/Natural Textures setting.

I still have a few things I'd like to improve on this, but I think that it's a good time to show my work, and also because the core of the code and mixins are ready enough for a review.

TODO list:

• Make Natural Textures disabled by default
• Add default natural.properties to assets
  (template file supporting vanilla textures and maybe ones from Et Futurum Requiem and other backports)
• Add support for vanilla blocks with custom renders
  (such as vines and crossed-squares blocks. Specific support might depend on the relevance that the block has with natural looking textures, and could be added later if the need arises)
  UPDATE: Additional support added for vines, crossed square blocks (tall grass, flowers, saplings, etc) and crops
• Use RPMCP's own Side class instead of ForgeDirection
• Test with Beddium
• Test compatibility with Hodgepodge PR #676 specifically
• Improve discovery of the natural.properties asset. Allow files from different resourcepacks to 'stack', like lang files do.
  (This is not a feature that the original Natural Textures supported, but would allow for texture packs to configure rotations for their own textures without overriding others, similar to how it works in modern MC. Also add a toggle for the old behavior)