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/clangreferencescollector.h

@@ -54,7 +54,8 @@ public:
 
 ReferencesResult collectReferences(CXTranslationUnit cxTranslationUnit,
                                    uint line,
-                                   uint column);
+                                   uint column,
+                                   bool localReferences = false);
 
 } // namespace ClangBackEnd