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.

bin/app/data/color_schemes/bright.xml

@@ -179,6 +179,11 @@
 				<normal>#DDD</normal>
 				<hover>#CCC</hover>
 			</file>
+
+			<undefined_macro>
+				<normal>#DDD</normal>
+				<hover>#CCC</hover>
+			</undefined_macro>
 			<macro>
 				<normal>#DDD</normal>
 				<hover>#CCC</hover>

bin/app/data/color_schemes/dark.xml

@@ -179,6 +179,11 @@
 				<normal>#1B564E</normal>
 				<hover>#247368</hover>
 			</file>
+
+			<undefined_macro>
+				<normal>#1B564E</normal>
+				<hover>#247368</hover>
+			</undefined_macro>
 			<macro>
 				<normal>#1B564E</normal>
 				<hover>#247368</hover>