Adjust SCUBA Gear autouse behaviour so it works properly with manual use.
Add 3D floor handling code on various things.
Increased size of Eightball explosions to match original game.
Fix invisibility playing no sound when activated.
Assigned all pickup models.
Implemented all ammo types.
Finished Flak Cannon.
Additional cleanup.
Slot reassignments and other adjustments to match known Unreal prototype info.
