Added catwalks and railings. Ported from Vorestation who ported them from Eris.
Note, catwalks can be placed on plating (as is seen on the vorestation map Tether) and is done so here as well. However it doesn't seem like it is possible to build said catwalks on plating. Did not bother to adjust this at this time. Something to sort in the future.
Adjusted SC station dmm to use both the railing and catwalks as well as a couple fixes for the floor tile adjustment in a earlier commit.
* Colored zpipes (like scrubbers or supply for example) would always lose color in game becuase atmospherics machinery sets color = null since most pipes use overlays and the icon cache. For better or worse, zpipes don't, they just use a normal icon_state, so they need color set.
* The proc obj/machinery/atmospherics/pipe/up/process was supposed to be obj/machinery/atmospherics/pipe/zpipe/process.
* Also changed hard coded integers to use constants while I was editing the file anyway.
* Port of https://github.com/Baystation12/Baystation12/pull/16942
* Actually tell turfs when a thrown object hits them, and let them decide what to do about it!
* We do this by calling hitby(), which is how it already works for obj and mob, so this makes behavior consistent.
* This allows us to cleanly solve the problem of a thrown object landing on open space without falling.
* Global procs should start with /proc
* Use to_chat() macro
* Added utility to find all z-levels are connected (transitively adjacent) and utility to test if two levels are connected.
More tweaks to IPC fixes.
Merge resolution/compile fixes.
Further work on properly integrating, updating and fixing prosthetic options.
Repathed internal organs to organ/internal.
More work on full synthetics, changelings, overheating.
Working on getting organs to qdel properly and spawn properly when robotized.
Finalized some overheating values, added remaining prosthetic icons.
Finalizing the testing version of the full prosthetic bodies branch.
Added suit cyclers to the autolathe and map.
Fixing runtime errors.
Fixing errors.
Changelog.
Replacing limb and organ strings with constants.
Prevented brainless species from becoming full cyborgs.
Fixed issues with brain/MMIs renaming themselves inappropriately.
Various fixes and oversights.
