NODROP flag addition & handling

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

code/modules/mining/manufacturing.dm

@@ -374,13 +374,13 @@
 		else ..()
 
 		if (load == 1)
-			user.u_equip(W)
+			user.unEquip(W)
 			W.loc = src
 			if ((user.client && user.s_active != src))
 				user.client.screen -= W
 			W.dropped()
 		else if (load == 2)
-			user.u_equip(W)
+			user.unEquip(W)
 			W.dropped()
 			if ((user.client && user.s_active != src))
 				user.client.screen -= W

code/modules/mining/satchel_ore_boxdm.dm

@@ -20,7 +20,7 @@
 
 /obj/structure/ore_box/attackby(obj/item/weapon/W as obj, mob/user as mob)
 	if (istype(W, /obj/item/weapon/ore))
-		user.u_equip(W)
+		user.unEquip(W)
 		src.contents += W
 	if (istype(W, /obj/item/weapon/storage))
 		var/obj/item/weapon/storage/S = W