/Icon/ Folder cleansing crusade part, I think 4; post-wallening clean-up. (#85823)

Hello everybuddy, your number three rated coder-failure here to clean up
some mess. This PR accomplishes some of the more major structural clean
up changes I wanted to do with /obj/ folder, but decided to wait on
until wallening gets merged, and so, time has come. Several things to
still be done, although I know these cleaning PR's are quite a load, so
will wait for this one to get done with first.

## Why It's Good For The Game
Saner spriters, better sprites, less annoyance. Also deleted a whole
load of redundancy this time around, a lot of sprites which existed
simultaniously in two places now got exit their quantum superposition.

code/game/objects/items/debug_items.dm

@@ -84,8 +84,8 @@
 		"Wrench" = image(icon = 'icons/obj/tools.dmi', icon_state = "wrench"),
 		"Welding Tool" = image(icon = 'icons/obj/tools.dmi', icon_state = "miniwelder"),
 		"Analyzer" = image(icon = 'icons/obj/devices/scanner.dmi', icon_state = "analyzer"),
-		"Pickaxe" = image(icon = 'icons/obj/mining.dmi', icon_state = "minipick"),
-		"Shovel" = image(icon = 'icons/obj/mining.dmi', icon_state = "shovel"),
+		"Pickaxe" = image(icon = 'icons/obj/mining_zones/equipment.dmi', icon_state = "minipick"),
+		"Shovel" = image(icon = 'icons/obj/mining_zones/equipment.dmi', icon_state = "shovel"),
 		"Retractor" = image(icon = 'icons/obj/medical/surgery_tools.dmi', icon_state = "retractor"),
 		"Hemostat" = image(icon = 'icons/obj/medical/surgery_tools.dmi', icon_state = "hemostat"),
 		"Cautery" = image(icon = 'icons/obj/medical/surgery_tools.dmi', icon_state = "cautery"),