* Frame stacking fix and unit test addition. (#56287)
* Reverts #56205
* Allow things without density to bypass checks
* The rest of the owl
* The rest of the owl
* Doc and tweak
* More feex
* RCD machine frame unit test
* I suck
* AAAAA
* Bad at unit tests
* Revert unit tests (for including in another PR)
* Fix windoor_assembly return logic
* Comment /mob/living/proc/PushAM logic
* Windoor assembley logic tweak
* Fix frame stacking
* Unit test
* Better wording from macros?
* Frame stacking fix and unit test addition.
Co-authored-by: Timberpoes <silent_insomnia_pp@hotmail.co.uk>