Added 1.21 support

**Please let me know if you find bugs!

- Add every blocks from https://minecraft.wiki/w/Smelting !
Now it’s a real furnace btw...

**Please let me know if you find bugs!

- Update for 1.20.6
- *NEW config.yml
- Improve code

**Please let me know if you find bugs!

+ config.yml
- language

**Please let me know if you find bugs!

+ config.yml
- Cooldowns
- Money (cost for /furnace)

Fix some problems
Vault required now!

**Please let me know if you find bugs!

+ food:
- Porkchop
- Salmon

**Please let me know if you find bugs!