/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/modules/mob/living/basic/drone/drone_tools.dm

@@ -48,7 +48,7 @@
 /obj/item/crowbar/drone
 	name = "built-in crowbar"
 	desc = "A crowbar built into your chassis."
-	icon = 'icons/obj/items_cyborg.dmi'
+	icon = 'icons/mob/silicon/robot_items.dmi'
 	icon_state = "toolkit_engiborg_crowbar"
 	inhand_icon_state = "crowbar"
 	item_flags = NO_MAT_REDEMPTION
@@ -56,7 +56,7 @@
 /obj/item/screwdriver/drone
 	name = "built-in screwdriver"
 	desc = "A screwdriver built into your chassis."
-	icon = 'icons/obj/items_cyborg.dmi'
+	icon = 'icons/mob/silicon/robot_items.dmi'
 	icon_state = "toolkit_engiborg_screwdriver"
 	inhand_icon_state = "screwdriver"
 	item_flags = NO_MAT_REDEMPTION
@@ -75,7 +75,7 @@
 /obj/item/wrench/drone
 	name = "built-in wrench"
 	desc = "A wrench built into your chassis."
-	icon = 'icons/obj/items_cyborg.dmi'
+	icon = 'icons/mob/silicon/robot_items.dmi'
 	icon_state = "toolkit_engiborg_wrench"
 	inhand_icon_state = "wrench"
 	item_flags = NO_MAT_REDEMPTION
@@ -83,14 +83,14 @@
 /obj/item/weldingtool/drone
 	name = "built-in welding tool"
 	desc = "A welding tool built into your chassis."
-	icon = 'icons/obj/items_cyborg.dmi'
+	icon = 'icons/mob/silicon/robot_items.dmi'
 	icon_state = "indwelder_cyborg"
 	item_flags = NO_MAT_REDEMPTION
 
 /obj/item/wirecutters/drone
 	name = "built-in wirecutters"
 	desc = "Wirecutters built into your chassis."
-	icon = 'icons/obj/items_cyborg.dmi'
+	icon = 'icons/mob/silicon/robot_items.dmi'
 	icon_state = "toolkit_engiborg_cutters"
 	inhand_icon_state = "cutters"
 	item_flags = NO_MAT_REDEMPTION
@@ -99,7 +99,7 @@
 /obj/item/multitool/drone
 	name = "built-in multitool"
 	desc = "A multitool built into your chassis."
-	icon = 'icons/obj/items_cyborg.dmi'
+	icon = 'icons/mob/silicon/robot_items.dmi'
 	icon_state = "toolkit_engiborg_multitool"
 	item_flags = NO_MAT_REDEMPTION
 	toolspeed = 0.5