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

servers/visual/shader_language.cpp

@@ -1171,7 +1171,9 @@ const ShaderLanguage::BuiltinsDef ShaderLanguage::ci_light_builtins_defs[]={
 	{ "LIGHT_VEC", TYPE_VEC2},
 	{ "LIGHT_HEIGHT", TYPE_FLOAT},
 	{ "LIGHT_COLOR", TYPE_VEC4},
+	{ "LIGHT_UV", TYPE_VEC2},
 	{ "LIGHT", TYPE_VEC4},
+	{ "SHADOW", TYPE_VEC4},
 	{ "POINT_COORD", TYPE_VEC2},
 //	{ "SCREEN_POS", TYPE_VEC2},
 //	{ "SCREEN_TEXEL_SIZE", TYPE_VEC2},