More 3D Work

-=-=-=-=-=-

-ESM Shadow Mapping for softer and less glitchy shadows
-HDR Pipeline (convert to Linear on texture import, convert to SRGB at the end)
-Fix to xml parse bug

modules/gdscript/gd_functions.h

@@ -89,6 +89,7 @@ public:
 		RESOURCE_LOAD,
 		INST2DICT,
 		DICT2INST,
+		HASH,
 		PRINT_STACK,
 		FUNC_MAX