Environments Industrial, dirty, rusty, locker room and showers

Following improvements:

• Deleted lights and camera from Unity scene
• Re-imported wall tiles, now they look better
• Removed emission from floor
• Packaged scene correctly (contains some lighting)
• Made fixes so that it might work in VR (I haven't tested it yet)

I updated the room:

• Added colliders for the locker, benches, floor and walls
• Adjusted the placement of some objects to close gaps
• Adjusted the thickness of one of the doors, which was just too thicc