ClangTools: Add unit-test for standalone ClangTidy+Clazy tool

Use simple project with only few ClangTidy and Clazy warnings.

Change-Id: Idfbbeb653c5f610bda502c3ec23e7497f503f8a9
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@qt.io>

src/plugins/clangtools/unit-tests/clangtidy_clazy/clazy_example.cpp

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+/****************************************************************************
+**
+** Copyright (C) 2018 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.
+**
+****************************************************************************/
+
+#include <QCoreApplication>
+
+// -Wclazy-ctor-missing-parent-argument
+class TestObject : public QObject
+{
+    Q_OBJECT
+
+public:
+    TestObject();
+
+    bool event(QEvent *) override
+    {
+        // -Wclazy-base-class-event
+        return false;
+    }
+};