data: Parsing type usages within function and method bodies

This change parses type usages in function and method bodies and saves them with an edge of type EDGE_TYPE_USAGE. This
also includes base class types used in initialization lists of derived class constructors.

bin/test/data/CxxParserTestSuite/header.h

@@ -1,6 +1,10 @@
 typedef unsigned int uint;
 
+class G
+{};
+
 class H
+	: public G
 {
 private:
 	int width;