Changes

Update `switch_face` to `attachment_face` and add bells (#2512)

* Bell `attachment` mechanism beginnings

* It worked the whole time! I was using the wrong `adjust` command :P

Thanks for letting me know Aya.

* Add `attachment` logic to `switch_face`

Also updates `MaterialSwitchFace` to new Property system

* Update mech to `attachment_face` and more optimizations

* Update meta and add value for `DOUBLE_WALL`
(commit: 7341333)