Merge pull request #8430 from Fox-McCloud/ied-buff

Buffs IEDs

code/datums/mutable_appearance.dm

@@ -0,0 +1,13 @@
+// Mutable appearances are an inbuilt byond datastructure. Read the documentation on them by hitting F1 in DM.
+// Basically use them instead of images for overlays/underlays and when changing an object's appearance if you're doing so with any regularity.
+// Unless you need the overlay/underlay to have a different direction than the base object. Then you have to use an image due to a bug.
+
+// Mutable appearances are children of images, just so you know.
+
+// Helper similar to image()
+/proc/mutable_appearance(icon, icon_state = "", layer = FLOAT_LAYER)
+	var/mutable_appearance/MA = new()
+	MA.icon = icon
+	MA.icon_state = icon_state
+	MA.layer = layer
+	return MA