Added "About swift dialog"

* Details as text edit, so users can cut and paste it for bug reports
* Removed setup/compile info from internals and show it in about
* display Qt icon for "About Qt"

src/blackgui/components/aboutdialog.h

@@ -0,0 +1,46 @@
+/* Copyright (C) 2017
+ * 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_COMPONENTS_ABOUTDIALOG_H
+#define BLACKGUI_COMPONENTS_ABOUTDIALOG_H
+
+#include <QDialog>
+#include <QScopedPointer>
+
+namespace Ui { class CAboutDialog; }
+namespace BlackGui
+{
+    namespace Components
+    {
+        /*!
+         * About dialog
+         */
+        class CAboutDialog : public QDialog
+        {
+            Q_OBJECT
+
+        public:
+            //! Constructor
+            explicit CAboutDialog(QWidget *parent = nullptr);
+
+            //! Destructor
+            virtual ~CAboutDialog();
+
+        private:
+            //! Init values
+            void init();
+
+            QScopedPointer<Ui::CAboutDialog> ui;
+        };
+    } // ns
+} // ns
+
+#endif // guard