Self Contained custom items sprites

to help reduce the amount of sprites in items_left|righthand.dmi

code/game/objects/items.dm

@@ -41,6 +41,7 @@
 	var/obj/item/device/uplink/hidden/hidden_uplink = null // All items can have an uplink hidden inside, just remember to add the triggers.
 	var/zoomdevicename = null //name used for message when binoculars/scope is used
 	var/zoom = 0 //1 if item is actively being used to zoom. For scoped guns and binoculars.
+	var/contained_sprite = 0 //1 if item_state, lefthand, righthand, and worn sprite are all in one dmi
 
 	/* Species-specific sprites, concept stolen from Paradise//vg/.
 	ex: