Cppcheck: Add ability to manually run cppcheck

Run cppcheck on selected files from current project via "Analyze"->"Cppcheck...."
Show results in a separate view in the same manner as ClangTools plugin.

Fixes: QTCREATORBUG-21673
Change-Id: Ibcaf4057a387a990f1da59025f15ba58f996953f
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@qt.io>

src/plugins/cppcheck/cppcheckdiagnosticsmodel.h

@@ -0,0 +1,81 @@
+/****************************************************************************
+**
+** Copyright (C) 2019 Sergey Morozov
+** 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 <cppcheck/cppcheckdiagnostic.h>
+#include <cppcheck/cppcheckdiagnosticmanager.h>
+
+#include <debugger/analyzer/detailederrorview.h>
+
+#include <utils/treemodel.h>
+
+namespace Cppcheck {
+namespace Internal {
+
+class DiagnosticsModel;
+
+class FilePathItem : public Utils::TreeItem
+{
+public:
+    explicit FilePathItem(const QString &filePath);
+    QVariant data(int column, int role) const override;
+
+private:
+    const QString m_filePath;
+};
+
+class DiagnosticItem : public Utils::TreeItem
+{
+public:
+    explicit DiagnosticItem(const Diagnostic &diagnostic);
+    QVariant data(int column, int role) const override;
+
+private:
+    const Diagnostic m_diagnostic;
+};
+
+using BaseModel = Utils::TreeModel<Utils::TreeItem, FilePathItem, DiagnosticItem>;
+
+class DiagnosticsModel : public BaseModel, public CppcheckDiagnosticManager
+{
+    Q_OBJECT
+public:
+    enum Column {DiagnosticColumn};
+
+    explicit DiagnosticsModel(QObject *parent = nullptr);
+    void clear();
+    void add(const Diagnostic &diagnostic) override;
+
+signals:
+    void hasDataChanged(bool hasData);
+
+private:
+    QHash<QString, FilePathItem *> m_filePathToItem;
+    QSet<Diagnostic> m_diagnostics;
+};
+
+} // namespace Internal
+} // namespace Cppcheck