Minor fixes for Coilhead features.

[1.2.3]

Coilhead's head item should no longer vanish from the ship after reloading the save file.
- 2
Coilhead's head item now spawns properly attached and facing the right way.
Coilhead's head item no longer floats above the ground when dropped/placed, and is upright.
- This also made it able to be properly placed inside the storage cabinet.
Coilhead's head item scale further reduced to 0.1763.
- Matches the size of the actual head.
Coilhead should no longer get stuck in its moving animation if killed while moving.
- Could happen previously while walking backwards into it while swinging the knife.
Coilhead's neck now wobbles one final time when killed, to indicate its death.
(Project) Publicized game assembly (to access certain fields and methods from SpringManAI).
(Project) Changed language version to preview to enable collection literals.