[ready] adds unit test for missing inhand icons. fixes a bunch of missing inhand icons (#70037)

fix: Fixed a bunch of missing inhand icons.
fix: Fixed cables in electrical toolboxes not randomizing their colors.
fix: Fixed the wrong colored icon showing when trying to make cable cuffs out of cables.
fix: The collectable SWAT helmet is now using the proper icon again!
refactor: Pipecleaners and power cables now share a unified color system, so they're once again available in ALL the same colors.
imageadd: Updated the screwdriver belt overlay to represent the newer sprite.
imageadd: Added a bunch of new inhand icons. Special thanks to Twaticus for doing the helmets! <3
fix: Wirecutters now have an icon when inside a belt again!
admin: Added a new omnitool subtype that allows you to spawn all items in a typepath!
fix: Explorer gaskmasks now properly reflect their adjusted state when held.
fix: Fixed balaclavas having the wrong icon when pulled up.
fix: Fixed the base energy sword (admin spawn only) being invisible.
fix: The rainbow energy sword is now a little bit more rainbowy!
fix: Fixed an tk exploit with orange handcuffed shoes.
fix: The traitor outfit in the select equipment panel is now actually functional!

code/modules/wiremod/core/component.dm

@@ -12,6 +12,8 @@
 	icon = 'icons/obj/module.dmi'
 	icon_state = "component"
 	inhand_icon_state = "electronic"
+	lefthand_file = 'icons/mob/inhands/items/devices_lefthand.dmi'
+	righthand_file = 'icons/mob/inhands/items/devices_righthand.dmi'
 
 	/// The name of the component shown on the UI
 	var/display_name = "Generic"

code/modules/wiremod/core/integrated_circuit.dm

@@ -14,6 +14,8 @@ GLOBAL_LIST_EMPTY_TYPED(integrated_circuits, /obj/item/integrated_circuit)
 	icon = 'icons/obj/module.dmi'
 	icon_state = "integrated_circuit"
 	inhand_icon_state = "electronic"
+	lefthand_file = 'icons/mob/inhands/items/devices_lefthand.dmi'
+	righthand_file = 'icons/mob/inhands/items/devices_righthand.dmi'
 
 	/// The name that appears on the shell.
 	var/display_name = ""

code/modules/wiremod/core/usb_cable.dm

@@ -4,7 +4,9 @@
 	desc = "A cable that can connect integrated circuits to anything with a USB port, such as computers and machines."
 	icon = 'icons/obj/wiremod.dmi'
 	icon_state = "usb_cable"
-	inhand_icon_state = "coil"
+	inhand_icon_state = "coil_yellow"
+	lefthand_file = 'icons/mob/inhands/equipment/tools_lefthand.dmi'
+	righthand_file = 'icons/mob/inhands/equipment/tools_righthand.dmi'
 	base_icon_state = "coil"
 	w_class = WEIGHT_CLASS_TINY
 	custom_materials = list(/datum/material/iron = 75)