CMO: Intergrate Mernom's bullet code.

Add the option for bullets to be made into projectiles.
The options may need to be: No change, Bullet Trail (Instant), Projectile.

And those options may need to be generated for the ammo groups for:
Pistol
Machine Gun
Sniper Rifle

Defaults should be:
Pistol: Bullet Trail (Instant)
Machine Gun: Projectile
Sniper Rifle: Bullet Trail (Instant)

If there is no dedicated pistol ammo then the pistol setting won't do anything.