Fruit picker compat: Rustic

[esotericist]

Rustic has an apple tree which works a bit differently from Pam's fruit trees:

The leaves are rustic:leaves_apple, with metadata starting at 0 when there's no fruit, 1 or 2 when fruit is growing, and 3 when ready to be harvested. In normal play, at this point one right-clicks the leaf block, gets an apple, and it resets back to metadata 0.