makes w_class use defines (#9848)

code/game/objects/items/stacks/medical.dm

@@ -19,7 +19,7 @@ Contains:
 	pickup_sound = 'sound/items/pickup/cardboardbox.ogg'
 	amount = 5
 	max_amount = 5
-	w_class = 2
+	w_class = ITEMSIZE_SMALL
 	throw_speed = 4
 	throw_range = 20
 	var/heal_brute = 0

code/game/objects/items/stacks/telecrystal.dm

@@ -5,7 +5,7 @@
 	singular_name = "telecrystal"
 	icon = 'icons/obj/telescience.dmi'
 	icon_state = "telecrystal"
-	w_class = 1
+	w_class = ITEMSIZE_TINY
 	max_amount = 50
 	flags = NOBLUDGEON
 	origin_tech = list(TECH_MATERIAL = 6, TECH_BLUESPACE = 4)

code/game/objects/items/stacks/tiles/tile_types.dm

@@ -10,7 +10,7 @@
 	name = "tile"
 	singular_name = "tile"
 	desc = "A non-descript floor tile"
-	w_class = 3
+	w_class = ITEMSIZE_NORMAL
 	max_amount = 60
 	icon = 'icons/obj/stacks/tiles.dmi'
 	item_icons = list(

code/game/objects/items/stacks/wrap.dm

@@ -17,7 +17,7 @@
 	if (!isturf(loc))
 		to_chat(user, SPAN_WARNING("The paper must be set down for you to wrap a gift!"))
 		return
-	if (W.w_class < 4)
+	if (W.w_class < ITEMSIZE_LARGE)
 		var/a_used = 2 * (src.w_class - 1)
 		if (src.amount < a_used)
 			to_chat(user, SPAN_WARNING("You need more paper!"))
@@ -81,7 +81,7 @@
 	icon = 'icons/obj/stacks/wrap.dmi'
 	icon_state = "deliveryPaper"
 	desc = "A roll of paper used to enclose an object for delivery."
-	w_class = 3.0
+	w_class = ITEMSIZE_NORMAL
 	amount = 25.0
 	var/wrapping_tag = "Sorting Office"
 	drop_sound = 'sound/items/drop/wrapper.ogg'
@@ -187,6 +187,6 @@
 	icon = 'icons/obj/stacks/wrap.dmi'
 	icon_state = "c_tube"
 	throwforce = 1
-	w_class = 2.0
+	w_class = ITEMSIZE_SMALL
 	throw_speed = 4
 	throw_range = 5