data: parsing and saving inheritance

This change parses inheritance in CxxParser and saves them as EDGE_INHERITANCE in the Storage's graph. Tests for correct
inheritance recognition were added to CxxParserTestSuite.

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bin/app/data/ProjectSettings.xml

@@ -1,4 +1,4 @@
 <?xml version="1.0" encoding="utf-8"?>
 <config>
 	<SourcePath>data/src</SourcePath>
-</config>
+</config>

bin/app/data/src/header.h

@@ -2,3 +2,6 @@ int main();
 void foo();
 int sum(int a, int b);
 int diff(int a, int b);
+
+class A {};
+class B : public A {};