refs #312, Navigator (aka navigation bars)

* different dyn. property names for main window, dock window and infoarea
* dyn.properties for nested QWidgets
* style sheet for navigator
* utility function to delete layout
* added standard OS icons, some formatting in CICons
* actions in main window to be used in navigator
* main window becomes normal window when minimized so it is correctly displayed in Win taskbar

Remark: Frameless floating dockwidgets with rounded borders not yet working

src/blackgui/guiutility.h

@@ -47,6 +47,9 @@ namespace BlackGui
         //! Replace count in name such as "stations (4)"
         static QString replaceTabCountValue(const QString &oldName, int count);
 
+        //! Delete hierarchy of layouts
+        static void deleteLayout(QLayout *layout, bool deleteWidgets);
+
     private:
         //! Constructor, use static methods only
         CGuiUtility() {}