[Suggestion for 1.13] Load submods from datapacks

[vico93]

Well, seems like in 1.13 Data Packs will be a thing.

Like resource packs but for servers or worlds. They have stuff like loot tables or advancements, instead of textures and clientside stuff.

What about add support for load submods from datapacks? For example, everything under CS4's namespace folder would be parsed by CS4 (for example: awesome_data_pack\customstuff4\<submod folder here>)

It would be a great way to organize things on MC directory (both client and server), being in a more vanilla feel, and a better way to distribute submods.