[Enhancement] Use datapack-like format for adding items.

[zowepsilon]

Instead of using .minecraft/itemsfromtext/<namespace>/<ITEM_ID.txt / ITEM_ID_name.png / ITEM_ID_recipe.json>, make a more datapack format for :

• adding an item => .minecraft/itempacks/<datapack name>/data/<namespace>/items/<ITEM_ID>.json (use json for more datapack-like experience)
• adding the texture => .minecraft/itempacks/<datapack name>/assets/<namespace>/item/<ITEM_ID>.png (and also load the pack as a resourcepack to allow further customization for appearance)
• adding the recipe => .minecraft/itempacks/<datapack name>/data/<namespace>/recipes/<ITEM_ID>.json (and also load the pack as a global datapack to allow further customization for mechanics, etc.)

And obviously use a pack.mcmeta in the pack root folder :)

[zowepsilon]

I think thats a good idea since it could allow global resourcepacks/datapacks that can be easily expanded for other additions (imagine making data-driven blocks next)