build: updated to new clang and other fixes

* don't save macros from external files
* fixed macro and include saving duplicates
* added NODE_UNDEFINED_MACRO

TIL = You need to cut a 1kg cake about 85 times in half until you have a piece with only a single atom.

src/lib/data/graph/Node.h

@@ -41,7 +41,9 @@ public:
 		NODE_TEMPLATE_PARAMETER_TYPE	= 0x4000,
 
 		NODE_FILE						= 0x8000,
-		NODE_MACRO						= 0x10000,
+
+		NODE_UNDEFINED_MACRO			= 0x10000,
+		NODE_MACRO						= 0x20000,
 	};
 
 	static std::string getTypeString(NodeType type);