Adds a support rail object.

The support rail lets you grab it, sort of like buckling into a chair,
that gives your shoes noslip. Useful for ZAS areas like airlocks. Also
includes icon.
No THIS one has the icons.
Fixes a really dumb overlap from my work on another commit
I made my mistakes. Got nowhere to run. But life goes on as I'm fading
away.
Editing.
Typecasting issue resolved#
another minor fix
Removed random extra costs from flatpacks.
Defficiency fixes
No more free weapons for taters
typo
Add support for the DMM multiple tiles on one turf underlaying
Merge pull request #2000 from Menshin/maploader_multitiles_support

Add support for the DMM multiple tiles on one turf underlaying
Merge pull request #1990 from Duny-/defficiency

Defficiency fixes
Merge pull request #1954 from Kurfursten/supportrail

Adds a support rail object.
Merge pull request #1985 from ComicIronic/MechanicPort

Removed random extra costs from flatpacks.
Move attack_verb to /obj/item (part of https://github.com/tgstation/-tg-station/commit/a97c4de9721a8407e6e6d5d516482a5bd6576dcf).
Merge pull request #1998 from eswordthecat/patch-8

Move attack_verb to /obj/item (part of https://github.com/tgstation/-tg-...
Reading from the configuration controller before its loaded means we'll never get runtime logging ;-;
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