Splits beds and chairs

Adds deconstruct structure helper
Moves chair sprites from objects.dmi to chairs.dmi
Fixes check shields passing proper flags on unarmed attacks
Makes stools and chairs able to be picked up

code/modules/holodeck/items.dm

@@ -88,18 +88,6 @@
 // Structures
 //
 
-/obj/structure/stool/bed/chair/holo/attackby(obj/item/weapon/W as obj, mob/user as mob)
-	if(istype(W,/obj/item/weapon/wrench))
-		user << "It's holographic!  There's no taking it apart."
-		return
-	..()
-
-/obj/structure/stool/bed/chair/holo/comfy
-	name = "comfy chair"
-	desc = "It looks comfy."
-	icon_state = "comfychair"
-	color = rgb(255,113,0)
-
 /obj/structure/holohoop
 	name = "basketball hoop"
 	desc = "Boom, shakalaka!"