Engine Damage, Weapon Damage, Debris Cutoff, etc.

Added:
- Engine damage reduces torque by up to 75%
- Weapon damage reduces accuracy by a factor of 4
- Engines have 1/8th the equivalent prop health
- Debris under a cutoff bounding box radius will be removed.
- Restored previous ACF armor values (SA multiplier from 8.5 to 6.45)

Done by Sestze (no stealing)