/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/tools/crowbar.dm

@@ -189,7 +189,7 @@
 /obj/item/crowbar/cyborg
 	name = "hydraulic crowbar"
 	desc = "A hydraulic prying tool, simple but powerful."
-	icon = 'icons/obj/items_cyborg.dmi'
+	icon = 'icons/mob/silicon/robot_items.dmi'
 	icon_state = "toolkit_engiborg_crowbar"
 	worn_icon_state = "toolkit_engiborg_crowbar" //error sprite - this shouldn't have been dropped
 	usesound = 'sound/items/jaws_pry.ogg'

code/game/objects/items/tools/screwdriver.dm

@@ -148,7 +148,7 @@
 /obj/item/screwdriver/cyborg
 	name = "automated screwdriver"
 	desc = "A powerful automated screwdriver, designed to be both precise and quick."
-	icon = 'icons/obj/items_cyborg.dmi'
+	icon = 'icons/mob/silicon/robot_items.dmi'
 	icon_state = "toolkit_engiborg_screwdriver"
 	hitsound = 'sound/items/drill_hit.ogg'
 	usesound = 'sound/items/drill_use.ogg'

code/game/objects/items/tools/weldingtool.dm

@@ -340,7 +340,7 @@
 /obj/item/weldingtool/largetank/cyborg
 	name = "integrated welding tool"
 	desc = "An advanced welder designed to be used in robotic systems. Custom framework doubles the speed of welding."
-	icon = 'icons/obj/items_cyborg.dmi'
+	icon = 'icons/mob/silicon/robot_items.dmi'
 	icon_state = "indwelder_cyborg"
 	toolspeed = 0.5
 

code/game/objects/items/tools/wirecutters.dm

@@ -77,7 +77,7 @@
 /obj/item/wirecutters/cyborg
 	name = "powered wirecutters"
 	desc = "Cuts wires with the power of ELECTRICITY. Faster than normal wirecutters."
-	icon = 'icons/obj/items_cyborg.dmi'
+	icon = 'icons/mob/silicon/robot_items.dmi'
 	icon_state = "toolkit_engiborg_cutters"
 	worn_icon_state = "cutters"
 	toolspeed = 0.5

code/game/objects/items/tools/wrench.dm

@@ -87,7 +87,7 @@
 /obj/item/wrench/cyborg
 	name = "hydraulic wrench"
 	desc = "An advanced robotic wrench, powered by internal hydraulics. Twice as fast as the handheld version."
-	icon = 'icons/obj/items_cyborg.dmi'
+	icon = 'icons/mob/silicon/robot_items.dmi'
 	icon_state = "toolkit_engiborg_wrench"
 	toolspeed = 0.5