Adds the ability to construct, destroy, and take apart bookcases.

Bookcases can be built using 5 wood planks.
Bookcases can be destroyed using weapons(50HP).
Bookcases can be taken apart using a wrench.

code/modules/library/lib_items.dm

@@ -18,6 +18,7 @@
 	anchored = 1
 	density = 1
 	opacity = 1
+	var/health = 50
 
 /obj/structure/bookcase/initialize()
 	for(var/obj/item/I in loc)
@@ -30,6 +31,18 @@
 		user.drop_item()
 		O.loc = src
 		update_icon()
+	else if(istype(O, /obj/item/weapon/wrench))
+		user << "\blue Now disassembling bookcase"
+		playsound(get_turf(src), 'sound/items/Ratchet.ogg', 50, 1)
+		if(do_after(user,50))
+			new /obj/item/stack/sheet/wood(get_turf(src))
+			new /obj/item/stack/sheet/wood(get_turf(src))
+			new /obj/item/stack/sheet/wood(get_turf(src))
+			new /obj/item/stack/sheet/wood(get_turf(src))
+			new /obj/item/stack/sheet/wood(get_turf(src))
+			density = 0
+			qdel(src)
+		return
 	else if(istype(O, /obj/item/weapon/pen))
 		var/newname = stripped_input(usr, "What would you like to title this bookshelf?")
 		if(!newname)
@@ -37,6 +50,18 @@
 		else
 			name = ("bookcase ([sanitize(newname)])")
 	else
+		switch(O.damtype)
+			if("fire")
+				src.health -= O.force * 1
+			if("brute")
+				src.health -= O.force * 0.75
+			else
+		if (src.health <= 0)
+			visible_message("<span class=warning>The bookcase is smashed apart!</span>")
+			new /obj/item/stack/sheet/wood(get_turf(src))
+			new /obj/item/stack/sheet/wood(get_turf(src))
+			new /obj/item/stack/sheet/wood(get_turf(src))
+			qdel(src)
 		..()
 
 /obj/structure/bookcase/attack_hand(var/mob/user as mob)