Ref T78, setting and dialog "do not show again"

Applies to automatic update info check

src/blackgui/settings/updatenotification.h

@@ -0,0 +1,34 @@
+/* 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_SETTINGS_UPDATENOTIFICATIONSETTINGS_H
+#define BLACKGUI_SETTINGS_UPDATENOTIFICATIONSETTINGS_H
+
+#include "blackgui/blackguiexport.h"
+#include "blackmisc/settingscache.h"
+
+namespace BlackGui
+{
+    namespace Settings
+    {
+        //! Trait for directory settings
+        struct TUpdateNotificationSettings : public BlackMisc::TSettingTrait<bool>
+        {
+            //! Key in data cache
+            static const char *key() { return "guiupdatenotification/%Application%"; }
+
+            //! Default, not consolidating
+            static const bool &defaultValue() { static const bool d = true; return d; }
+        };
+    } // ns
+} // ns
+
+#endif // guard