Gear Upgrade Cores

This is a pretty basic mod that adds Upgrade Cores to the game, which can be used in a smithing table in a similar fashion to netherite ingots to upgrade preexisting gear, keeping the names and enchantments with it.

Free to use in modpacks, credit where able, you know the drill.

(Yeah, I know that the Netherite Upgrade Core is kinda useless at the moment, I'm trying to come up with a better solution for that, which'll probably end up involving replacing the crafting recipes for netherite tools with ones more similar to other tiers of gear.)