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.
Merge pull request #1 from d3athrow/Bleeding-Edge

Bleeding edge
Window Deconstruction

Deconstruct windows when they're fully unanchored with a wrench
Address issues 

Not gonna bother mucking around in the code to delete reinf in this PR.
Welding tool is now required.

Also fix the build failiure
Changelog
Merge pull request #1989 from Heredth/tiptoethroughthewindow

Window Deconstruction port from Bay
Merge pull request #1995 from eswordthecat/patch-8

Fixes light going through walls (https://github.com/tgstation/-tg-statio...
Fixes light going through walls (https://github.com/tgstation/-tg-station/commit/b41303714dd6ba99c222513dad0389468745fa64).
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.