refs #485, moved central GUI functionality to sGui

* allow to send status message to main window (from everywhere)
* Use sGui::changedStylesheet where possible
* message when model is stashed
* improved application startup

src/blackgui/mainwindowaccess.h

@@ -0,0 +1,31 @@
+/* Copyright (C) 2016
+ * 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.
+ */
+
+#ifndef BLACKGUI_MAINWINDOWACCESS_H
+#define BLACKGUI_MAINWINDOWACCESS_H
+
+#include "blackmisc/statusmessage.h"
+
+namespace BlackGui
+{
+    /*!
+     * Direct acccess to main window`s status bar, info bar and such
+     */
+    class IMainWindowAccess
+    {
+    public:
+        //! Display in status bar
+        virtual bool displayInStatusBar(const BlackMisc::CStatusMessage &message) = 0;
+
+        //! Display in overlay window
+        virtual bool displayInOverlayWindow(const BlackMisc::CStatusMessage &message) = 0;
+    };
+} // ns
+
+#endif // guard