Improve handling of variables for decomp parser (#376)

* Parser refactor:
- Handling LIRBARY and STRING markers
- Extracting global variable name for future comparison
- Marking function static variables
- More fluent error messages

* String constants annotated with STRING

* fix variable name

* Should compare LIBRARY markers

LEGO1/ambulance.h

@@ -12,7 +12,7 @@ public:
 	// FUNCTION: LEGO1 0x10035fa0
 	inline virtual const char* ClassName() const override // vtable+0x0c
 	{
-		// GLOBAL: LEGO1 0x100f03c4
+		// STRING: LEGO1 0x100f03c4
 		return "Ambulance";
 	}