Improvements:

• Make husks static after they're created, i.e. they won't move to center of current cell.

• Some units probably shouldn't "throw" their turret away, i.e. it should remain attached to the body. However, ThrowsParticle does not take Turreted.Offset into account when calculating particle position.

Implementation tasks:

• Husk trait: make DragAndCrush optional
• ThrowsParticle trait: optionally adjust offset using TurretedInfo.Offset