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/tidy_example.cpp

@@ -0,0 +1,39 @@
+/****************************************************************************
+**
+** 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.
+**
+****************************************************************************/
+
+class Base
+{
+public:
+    // misc-noexcept-move-constructor
+    // misc-unconventional-assign-operator
+    // misc-unused-parameters
+    Base operator=(Base &&param) { return {}; }
+    virtual int function()
+    {
+        // modernize-use-nullptr
+        int *a = 0;
+        return 0;
+    }
+};