Tommy's Better Anvil

Now Support from 1.20 all the way to 1.21 (ALL snapshots included)

New features:

1. Now you can tell the difference between damaged, chipped and normal anvil instead of using the same texture

Bug fixes:

1. Reduced the gap between two anvils when one of them is on top of another (still have 1 pixel gap but I'm too lazy :( )
2. Reduced the huge lag caused by too much useless part of the model get rendered

Bug fix: (Intial release version accidently deleted by me lol)

1. GUI model changed
2. removed unnessesary model: "r.json"