Because of the complications with the new tags system, a need to use tile entities to store material data and general hassle with the items, the way we register things should be changed.

TODO:

• Clean up the existing code
• Add an event for other mods to register materials
• Change the items to register in the old way (using only ids, like immersivegeology:ingot_copper)
• Add a custom model loader for mass loading of the item models
• Add a custom blockstate loader for mass loading of the blockstates

Optional:

• Add an ability to specify a custom texture / model for the material

Better to use BlockStates than TileEntities, could otherwise cause lag.