🚀 c18830a Metallurgy item selector optimizations (#1192)

* Reorder main

* Remove unused custom data?

* OnGround nbt check -> predicate

* Move item logic into main

* Add back scoreboard command that i removed accidentall

* Limit 2nd selector

* Remove on_ground check from 2nd selector
- tests were failing :(

* Fix everything aaaaaaaaaaaa

* squash `check_mould_creation` down and remove

Author: runcows