Clang: use local renaming based on ClangCodeModel

Provide refactoring engine for ClangCodeModel and
implement missing methods.

Change-Id: If5c913e0c5a7941cd2ced54d0fcfa4d625eadc93
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@qt.io>

src/tools/clangbackend/source/clangjobrequest.h

@@ -118,6 +118,7 @@ public:
     qint32 funcNameStartColumn = -1;
     quint64 ticketNumber = 0;
     Utf8StringVector dependentFiles;
+    bool localReferences = false;
 };
 
 using JobRequests = QVector<JobRequest>;