NODROP flag addition & handling

- Purges canremove
- Implements functionality for NODROP flag, replaces canremove
- Refactors mob inventory unequipping.

code/game/objects/structures/stool_bed_chair_nest/stools.dm

@@ -56,14 +56,14 @@
 /obj/item/weapon/stool/attack_self(mob/user as mob)
 	..()
 	origin.loc = get_turf(src)
-	user.u_equip(src)
+	user.unEquip(src)
 	user.visible_message("\blue [user] puts [src] down.", "\blue You put [src] down.")
 	del src
 
 /obj/item/weapon/stool/attack(mob/M as mob, mob/user as mob)
 	if (prob(5) && istype(M,/mob/living))
 		user.visible_message("\red [user] breaks [src] over [M]'s back!.")
-		user.u_equip(src)
+		user.unEquip(src)
 		var/obj/item/stack/sheet/metal/m = new/obj/item/stack/sheet/metal
 		m.loc = get_turf(src)
 		del src

code/game/objects/structures/tables_racks.dm

@@ -373,7 +373,8 @@
 		return
 	if(isrobot(user))
 		return
-	user.drop_item()
+	if(!user.drop_item())
+		return
 	if (O.loc != src.loc)
 		step(O, get_dir(O, src))
 	return
@@ -737,7 +738,8 @@
 		return
 	if(isrobot(user))
 		return
-	user.drop_item()
+	if(!user.drop_item())
+		return
 	if (O.loc != src.loc)
 		step(O, get_dir(O, src))
 	return
@@ -750,8 +752,11 @@
 		return
 	if(isrobot(user))
 		return
-	user.drop_item()
-	if(W && W.loc)	W.loc = src.loc
+	if(!(W.flags & ABSTRACT))
+		if(user.drop_item())
+			W.Move(loc)
+	if(W && W.loc)
+		W.loc = src.loc
 	return
 
 /obj/structure/rack/meteorhit(obj/O as obj)