Revert "Framework for (hopefully) reducing memory usage by replacing thousands of decals with turfs that look visually identical (#12383)" (#12387)

This reverts commit ab86d669a7.

code/game/turfs/simulated/floor/plasteel_floor.dm

@@ -146,95 +146,3 @@
 
 /turf/open/floor/plasteel/sepia
 	icon_state = "sepia"
-
-///////////////////////////////
-// Pre-Applied Decal Floors //
-//////////////////////////////
-
-// Neutral
-/turf/open/floor/plasteel/neutral
-	icon_state = "neutral_full"
-/turf/open/floor/plasteel/neutral/side
-	icon_state = "neutral"
-/turf/open/floor/plasteel/neutral/corner
-	icon_state = "neutral_corner"
-
-// Dark Neutral
-/turf/open/floor/plasteel/dark/neutral
-	icon_state = "dark_neutral_full"
-/turf/open/floor/plasteel/dark/neutral/checker
-	icon_state = "dark_neutral_checker"
-/turf/open/floor/plasteel/dark/neutral/side
-	icon_state = "dark_neutral"
-/turf/open/floor/plasteel/dark/neutral/corner
-	icon_state = "dark_neutral_corner"
-
-// Dark Security
-/turf/open/floor/plasteel/dark/security
-	icon_state = "dark_red_full"
-/turf/open/floor/plasteel/dark/security/checker
-	icon_state = "dark_red_checker"
-/turf/open/floor/plasteel/dark/security/side
-	icon_state = "dark_red"
-/turf/open/floor/plasteel/dark/security/corner
-	icon_state = "dark_red_corner"
-
-// Engineering
-/turf/open/floor/plasteel/engineering
-	icon_state = "engineering_full"
-/turf/open/floor/plasteel/engineering/side
-	icon_state = "engineering"
-/turf/open/floor/plasteel/engineering/corner
-	icon_state = "engineering_corner"
-
-// Atmospherics
-/turf/open/floor/plasteel/atmospherics
-	icon_state = "atmospherics_full"
-/turf/open/floor/plasteel/atmospherics/side
-	icon_state = "atmospherics"
-/turf/open/floor/plasteel/atmospherics/corner
-	icon_state = "atmospherics_corner"
-
-// Command
-/turf/open/floor/plasteel/command
-	icon_state = "command_full"
-/turf/open/floor/plasteel/command/side
-	icon_state = "command"
-/turf/open/floor/plasteel/command/corner
-	icon_state = "command_corner"
-
-// Medical
-/turf/open/floor/plasteel/medical
-	icon_state = "medical_full"
-/turf/open/floor/plasteel/medical/alt
-	icon_state = "medical_alt"
-/turf/open/floor/plasteel/medical/side
-	icon_state = "medical"
-/turf/open/floor/plasteel/medical/corner
-	icon_state = "medical_corner"
-
-// Security
-/turf/open/floor/plasteel/security
-	icon_state = "security_full"
-/turf/open/floor/plasteel/security/side
-	icon_state = "security"
-/turf/open/floor/plasteel/security/corner
-	icon_state = "security_corner"
-
-// Cargo
-/turf/open/floor/plasteel/cargo
-	icon_state = "cargo_full"
-/turf/open/floor/plasteel/cargo/side
-	icon_state = "cargo"
-/turf/open/floor/plasteel/cargo/corner
-	icon_state = "cargo_corner"
-
-// Misc
-/turf/open/floor/plasteel/showroomfloor/shower
-	icon_state = "shower"
-/turf/open/floor/plasteel/goonplaque/alien
-	icon_state = "plaque1"
-	desc = "\"This is a plaque is a collaboration of iconography celebrating the peaceful collaboration between the people of Earth and distant alien species."
-/turf/open/floor/plasteel/goonplaque/charter
-	icon_state = "plaque2"
-	desc = "\"A golden plaque. Etched into it is the introductory article for a cross-species interplanetary constitution, guaranteeing equal rights between species that Nanotrasen relunctantly agreed to."