Adds defines for mouse_opacity

code/game/objects/effects/effect_system/effect_system.dm

@@ -8,7 +8,7 @@ would spawn and follow the beaker, even if it is carried or thrown.
 
 /obj/effect/particle_effect
 	name = "particle effect"
-	mouse_opacity = 0
+	mouse_opacity = MOUSE_OPACITY_TRANSPARENT
 	pass_flags = PASSTABLE | PASSGRILLE
 
 /obj/effect/particle_effect/New()

code/game/objects/effects/effect_system/effects_explosion.dm

@@ -27,7 +27,7 @@
 	icon_state = "explosion"
 	opacity = 1
 	anchored = TRUE
-	mouse_opacity = 0
+	mouse_opacity = MOUSE_OPACITY_TRANSPARENT
 	pixel_x = -32
 	pixel_y = -32
 

code/game/objects/effects/effect_system/effects_foam.dm

@@ -12,7 +12,7 @@
 	anchored = TRUE
 	density = FALSE
 	layer = WALL_OBJ_LAYER
-	mouse_opacity = 0
+	mouse_opacity = MOUSE_OPACITY_TRANSPARENT
 	var/amount = 3
 	animate_movement = 0
 	var/metal = 0

code/game/objects/effects/effect_system/effects_smoke.dm

@@ -11,7 +11,7 @@
 	opacity = 0
 	layer = FLY_LAYER
 	anchored = TRUE
-	mouse_opacity = 0
+	mouse_opacity = MOUSE_OPACITY_TRANSPARENT
 	animate_movement = 0
 	var/amount = 4
 	var/lifetime = 5

code/game/objects/effects/effect_system/effects_water.dm

@@ -4,7 +4,7 @@
 	name = "water"
 	icon_state = "extinguish"
 	var/life = 15
-	mouse_opacity = 0
+	mouse_opacity = MOUSE_OPACITY_TRANSPARENT
 
 
 /obj/effect/particle_effect/water/New()