Bocchi! But as a rock! Adds a Bocchi Rock... and some additions to the Note Blocks

Currently mod adds:
- Bocchi Rocks which spawns in plains and meadows and can be thrown
- Picks crafted by stonecutting Bocchi Rock and can be used on Note Block to play new guitar sound without new block underneath it
- Block of Picks made of 9 picks that changes Note Block's sound
- Amp that also changes Note Block's sound
- Vanilla skulls now have their own meme instruments when placed under the Note Block
