[MIRROR] Adds sidings floor decorations (#879)

* Adds sidings floor decorations (#53797)

This was a frequent request from mappers ever since trimlines were added, they work similarly to trimlines but they have different use cases and don't necessarily work together, so I am calling them sidings to avoid confusion.
Whereas trimlines are floor paint for plating, these are solid borders to be used either alongside walls, smoothing transitions between floor types or mark/split an area without having to use walls, and work with any floor type.

These are ALL greyscaled, so they're trivial to bikeshed customize and make new types for your mapping needs
- Colored (plastic/vinyl strips, standard departmental colors)
- Plating(metal, grey/white/dark)
- Wood(it's wood)

I've added them to meta's bar as a small example

* Adds sidings floor decorations

Co-authored-by: Mickyan <38563876+Mickyan@users.noreply.github.com>

code/game/objects/effects/decals/turfdecal/markings.dm

@@ -186,3 +186,137 @@
 
 /obj/effect/turf_decal/mining/survival
 	icon_state = "survival"
+
+/obj/effect/turf_decal/siding
+	icon_state = "siding_line"
+
+/obj/effect/turf_decal/siding/white
+	color = "#BCBCBC"
+
+/obj/effect/turf_decal/siding/white/corner
+	icon_state = "siding_corner"
+
+/obj/effect/turf_decal/siding/white/end
+	icon_state = "siding_end"
+
+/obj/effect/turf_decal/siding/red
+	color = "#DE3A3A"
+
+/obj/effect/turf_decal/siding/red/corner
+	icon_state = "siding_corner"
+
+/obj/effect/turf_decal/siding/red/end
+	icon_state = "siding_end"
+
+/obj/effect/turf_decal/siding/green
+	color = "#9FED58"
+
+/obj/effect/turf_decal/siding/green/corner
+	icon_state = "siding_corner"
+
+/obj/effect/turf_decal/siding/green/end
+	icon_state = "siding_end"
+
+/obj/effect/turf_decal/siding/blue
+	color = "#52B4E9"
+
+/obj/effect/turf_decal/siding/blue/corner
+	icon_state = "siding_corner"
+
+/obj/effect/turf_decal/siding/blue/end
+	icon_state = "siding_end"
+
+/obj/effect/turf_decal/siding/yellow
+	color = "#EFB341"
+
+/obj/effect/turf_decal/siding/yellow/corner
+	icon_state = "siding_corner"
+
+/obj/effect/turf_decal/siding/yellow/end
+	icon_state = "siding_end"
+
+/obj/effect/turf_decal/siding/purple
+	color = "#D381C9"
+
+/obj/effect/turf_decal/siding/purple/corner
+	icon_state = "siding_corner"
+
+/obj/effect/turf_decal/siding/purple/end
+	icon_state = "siding_end"
+
+/obj/effect/turf_decal/siding/brown
+	color = "#A46106"
+
+/obj/effect/turf_decal/siding/brown/corner
+	icon_state = "siding_corner"
+
+/obj/effect/turf_decal/siding/brown/end
+	icon_state = "siding_end"
+
+/obj/effect/turf_decal/siding/wood
+	icon_state = "siding_wood_line"
+	color = "#55391A"
+
+/obj/effect/turf_decal/siding/wood/corner
+	icon_state = "siding_wood_corner"
+
+/obj/effect/turf_decal/siding/wood/end
+	icon_state = "siding_wood_end"
+
+/obj/effect/turf_decal/siding/thinplating
+	icon_state = "siding_thinplating_line"
+	color = "#aaaaaa"
+
+/obj/effect/turf_decal/siding/thinplating/corner
+	icon_state = "siding_thinplating_corner"
+
+/obj/effect/turf_decal/siding/thinplating/end
+	icon_state = "siding_thinplating_end"
+
+/obj/effect/turf_decal/siding/thinplating/light
+	color = "#FFFFFF"
+
+/obj/effect/turf_decal/siding/thinplating/light/corner
+	icon_state = "siding_thinplating_corner"
+
+/obj/effect/turf_decal/siding/thinplating/light/end
+	icon_state = "siding_thinplating_end"
+
+/obj/effect/turf_decal/siding/thinplating/dark
+	icon_state = "siding_thinplating_line"
+	color = "#474747"
+
+/obj/effect/turf_decal/siding/thinplating/dark/corner
+	icon_state = "siding_thinplating_corner"
+
+/obj/effect/turf_decal/siding/thinplating/dark/end
+	icon_state = "siding_thinplating_end"
+
+/obj/effect/turf_decal/siding/wideplating
+	icon_state = "siding_wideplating_line"
+	color = "#aaaaaa"
+
+/obj/effect/turf_decal/siding/wideplating/corner
+	icon_state = "siding_wideplating_corner"
+
+/obj/effect/turf_decal/siding/wideplating/end
+	icon_state = "siding_wideplating_end"
+
+/obj/effect/turf_decal/siding/wideplating/light
+	color = "#FFFFFF"
+
+/obj/effect/turf_decal/siding/wideplating/light/corner
+	icon_state = "siding_wideplating_corner"
+
+/obj/effect/turf_decal/siding/wideplating/light/end
+	icon_state = "siding_wideplating_end"
+
+/obj/effect/turf_decal/siding/wideplating/dark
+	icon_state = "siding_wideplating_line"
+	color = "#474747"
+
+/obj/effect/turf_decal/siding/wideplating/dark/corner
+	icon_state = "siding_wideplating_corner"
+
+/obj/effect/turf_decal/siding/wideplating/dark/end
+	icon_state = "siding_wideplating_end"