Changes to Light

-=-=-=-=-=-=-=-=

-Changed material unshaded property for an enum, which supports light-only shading
-Added a "Mix" shading mode, useful for using lights as masks
-Added energy parameter to Light2D

2d/light_mask/engine.cfg

@@ -0,0 +1,4 @@
+[application]
+
+name="Using Lights As Mask"
+main_scene="res://lightmask.scn"