Removed the unused DiffUnlitEnvCube thechnique.
Removed the unused DiffUnlitEnvCube thechnique.

rsredsq/AtomicGameEngine,rsredsq/AtomicGameEngine,rsredsq/AtomicGameEngine,rsredsq/AtomicGameEngine,rsredsq/AtomicGameEngine,rsredsq/AtomicGameEngine,rsredsq/AtomicGameEngine,rsredsq/AtomicGameEngine,rsredsq/AtomicGameEngine,rsredsq/AtomicGameEngine,rsredsq/AtomicGameEngine