CppEditor/CppTools: Introduce Test{Case,Document}

Move common functionality of the 12 test classes into base classes.

Change-Id: If64d3cec876807ac6f991151189860a99b8ff4ca
Reviewed-by: Erik Verbruggen <erik.verbruggen@digia.com>

src/plugins/cpptools/cppmodelmanagerinterface.h

@@ -268,6 +268,8 @@ public:
     virtual void setIndexingSupport(CppTools::CppIndexingSupport *indexingSupport) = 0;
     virtual CppIndexingSupport *indexingSupport() = 0;
 
+    virtual void setIncludePaths(const QStringList &includePaths) = 0;
+
 signals:
     /// Project data might be locked while this is emitted.
     void aboutToRemoveFiles(const QStringList &files);