Chest Cavity [Fabric]

Changes:
-Player chest cavities are replaced on death.
--New organs are generated with the new chest cavity.
--Organs enchanted with O-Negative II will be migrated to the new body, overriding organs it their positions.
---If this results in a non-viable chest cavity, they will be ejected to make room for rotten welfare organs.
--Old organs will not be compatible with new bodies.

Bugfixes:
-REI will stop complaining.

Removals:
-Requiem compatibility has been removed due to requiem no longer being a fabric mod.