Detective Work (trace evidence) [Ready]

Added gun trace evidence.
Adds evidence on the shooter, the victim (including hit objects), the gun, and the casings.
Adds appropriate descriptions for most projectiles. Laser guns don't leave traces on the shooter.

Doubled and then some the chance for fibers to be placed on objects and clothing.

Adds fibers from the victim to weapons.

Unrelated fixes to make eguns and coins show up in the map editor.