Automatic Inventory

• Now recognizes potions with different attributes as distinct potions, instead of lumping all potions together.

I'm actually not sure if this is compatible with versions below 1.13. My guess is that it probably is all the way down to 1.9 since the only non-abstract thing it uses is the main hand/off hand inventory enums. Let me know if this isn't the case, that is, only if you insist on using ancient server versions.