`items.xml` improvements

[Foks256]

The ability to add some missing health types:

• [ ] brokenHearts
• [ ] rottenHearts
• [ ] goldenHearts
• [ ] boneHearts
• [ ] eternalHeart
• [ ] healthLimit

The ability to change player stats. The ability to set minUsableCharge for active items. The ability to set how much charge an active item depletes on use.

I'll add more if I think of anything, but I think these would be cool to have.