RnD & Cat fixes (#1913)

changes:

bugfix: "Fixed an issue where some objects could not be deconstructed with RnD."
bugfix: "Helmet lights now actually display the powered-on sprite."
bugfix: "Cats on heads no longer magically turn invisible."
bugfix: "Cyborgs' portable destructive analyzer can no longer steal intercoms or the captain's safe."
imageadd: "Duffle (duffel?) bags now have in-hand sprites."
Fixes #1158 
Fixes #1662

code/modules/mob/holder.dm

@@ -355,19 +355,17 @@ var/list/holder_mob_icon_cache = list()
 	desc_dead = "It used to be a little plant critter."
 	icon_state = "nymph"
 	icon_state_dead = "nymph_dead"
-	origin_tech = "magnets=3;biotech=5"
+	origin_tech = list(TECH_MAGNET = 3, TECH_BIO = 5)
 	slot_flags = SLOT_HEAD | SLOT_OCLOTHING
 	w_class = 2
 
 
-
-
 /obj/item/weapon/holder/drone
 	name = "maintenance drone"
 	desc = "It's a small maintenance robot."
 	icon_state = "drone"
 	item_state = "drone"
-	origin_tech = "magnets=3;engineering=5"
+	origin_tech = list(TECH_MAGNET = 3, TECH_ENGINEERING = 5)
 	slot_flags = SLOT_HEAD
 	w_class = 4
 	contained_sprite = 1
@@ -410,7 +408,7 @@ var/list/holder_mob_icon_cache = list()
 	name = "cortical borer"
 	desc = "It's a slimy brain slug. Gross."
 	icon_state = "brainslug"
-	origin_tech = "biotech=6"
+	origin_tech = list(TECH_BIO = 6)
 	w_class = 1
 
 /obj/item/weapon/holder/monkey
@@ -457,7 +455,7 @@ var/list/holder_mob_icon_cache = list()
 	icon_state_dead = "mouse_brown_dead"
 	slot_flags = SLOT_EARS
 	contained_sprite = 1
-	origin_tech = "biotech=2"
+	origin_tech = list(TECH_BIO = 2)
 	w_class = 1
 
 /obj/item/weapon/holder/mouse/white

code/modules/mob/living/carbon/human/update_icons.dm

@@ -779,8 +779,9 @@ var/global/list/damage_icon_parts = list()
 
 		if(istype(head,/obj/item/clothing/head))
 			var/obj/item/clothing/head/hat = head
-			if(hat.on && light_overlay_cache["[hat.light_overlay]"])
-				standing.overlays |= light_overlay_cache["[hat.light_overlay]"]
+			var/cache_key = "[hat.light_overlay]_[species.get_bodytype()]"
+			if(hat.on && light_overlay_cache["[cache_key]"])
+				standing.overlays |= light_overlay_cache["[cache_key]"]
 
 		standing.color = head.color
 		overlays_standing[HEAD_LAYER] = standing

code/modules/mob/living/silicon/robot/robot_items.dm

@@ -90,7 +90,10 @@
 			user << "Your [src] already has something inside.  Analyze or eject it first."
 			return
 		var/obj/item/I = target
-		I.loc = src
+		if (I.anchored)
+			user << span("notice", "\The [I] is anchored in place.")
+			return
+		I.forceMove(src)
 		loaded_item = I
 		for(var/mob/M in viewers())
 			M.show_message(text("<span class='notice'>[user] adds the [I] to the [src].</span>"), 1)