refs #474, role class so I can start with access rights in mapping GUI

Remark: Added upfront, as I need that for the screenshots when writing the BLOG article

src/blackgui/roles.cpp

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+/* Copyright (C) 2015
+ * swift project Community / Contributors
+ *
+ * This file is part of swift project. It is subject to the license terms in the LICENSE file found in the top-level
+ * directory of this distribution and at http://www.swift-project.org/license.html. No part of swift project,
+ * including this file, may be copied, modified, propagated, or distributed except according to the terms
+ * contained in the LICENSE file.
+ */
+
+#include "roles.h"
+
+namespace BlackGui
+{
+    CRoles::CRoles() { }
+
+    bool CRoles::hasRole(const QString &role) const
+    {
+        return m_roles.contains(role);
+    }
+
+    bool CRoles::isAdmin() const
+    {
+        return m_roles.contains("ADMIN");
+    }
+
+    void CRoles::setAdmin(bool admin)
+    {
+        if (admin)
+        {
+            if (isAdmin()) { return; }
+            m_roles.append("ADMIN");
+        }
+        else
+        {
+            m_roles.removeAll("ADMIN");
+        }
+    }
+
+    CRoles &CRoles::roles()
+    {
+        static CRoles roles;
+        return roles;
+    }
+
+} // roles

src/blackgui/roles.h

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+/* Copyright (C) 2015
+ * swift project Community / Contributors
+ *
+ * This file is part of swift project. It is subject to the license terms in the LICENSE file found in the top-level
+ * directory of this distribution and at http://www.swift-project.org/license.html. No part of swift project,
+ * including this file, may be copied, modified, propagated, or distributed except according to the terms
+ * contained in the LICENSE file.
+ */
+
+//! \file
+
+#ifndef BLACKGUI_ROLES_H
+#define BLACKGUI_ROLES_H
+
+#include "blackgui/blackguiexport.h"
+#include <QStringList>
+
+namespace BlackGui
+{
+    /*!
+     * Roles
+     */
+    class BLACKGUI_EXPORT CRoles
+    {
+    public:
+        //! Has role?
+        bool hasRole(const QString &role) const;
+
+        //! Admin?
+        bool isAdmin() const;
+
+        //! Set admin
+        void setAdmin(bool admin);
+
+        //! Roles
+        static CRoles &roles();
+
+    private:
+        //! Constructor
+        CRoles();
+
+        QStringList m_roles;
+    };
+
+} // ns
+
+#endif // guard