Replaces ex_act and emp_act numbers with defines

code/modules/projectiles/guns/beam_rifle.dm

@@ -355,7 +355,7 @@
 		if(wall_pierce++ < wall_pierce_amount)
 			loc = target
 			if(prob(wall_devastate))
-				target.ex_act(2)
+				target.ex_act(EXPLODE_HEAVY)
 			return TRUE
 	if(ismovableatom(target))
 		var/atom/movable/AM = target

code/modules/projectiles/guns/misc/blastcannon.dm

@@ -112,11 +112,11 @@
 /obj/item/projectile/blastwave/Range()
 	..()
 	if(heavyr)
-		loc.ex_act(1)
+		loc.ex_act(EXPLODE_DEVASTATE)
 	else if(mediumr)
-		loc.ex_act(2)
+		loc.ex_act(EXPLODE_HEAVY)
 	else if(lightr)
-		loc.ex_act(3)
+		loc.ex_act(EXPLODE_LIGHT)
 	else
 		qdel(src)
 	heavyr--