CppEditor: add default RefactoringEngine

..and use it when we don't have refactoring plug-in

Change-Id: Ibe317a9728d439b9c5e05271d92a330d22eaacb9
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@qt.io>

src/plugins/cppeditor/cpprefactoringengine.h

@@ -0,0 +1,46 @@
+/****************************************************************************
+**
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of Qt Creator.
+**
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+****************************************************************************/
+
+#pragma once
+
+#include <cpptools/refactoringengineinterface.h>
+
+namespace CppEditor {
+namespace Internal {
+
+class CppEditorWidget;
+
+class CppRefactoringEngine : public CppTools::RefactoringEngineInterface
+{
+public:
+    void startLocalRenaming(const CppTools::CursorInEditor &data,
+                            CppTools::ProjectPart *projectPart,
+                            RenameCallback &&renameSymbolsCallback) override;
+
+    bool isUsable() const override { return true; }
+};
+
+} // namespace Internal
+} // namespace CppEditor