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/components/invisibleinfoareacomponent.h

@@ -11,6 +11,7 @@
 #define BLACKGUI_COMPONENTS_INVISIBLEINFOAREACOMPONENT_H
 
 #include "blackgui/infoarea.h"
+#include "blackgui/components/navigatordockwidget.h"
 #include <QMainWindow>
 
 namespace Ui { class CInvisibleInfoAreaComponent; }
@@ -47,6 +48,9 @@ namespace BlackGui
             //! \copydoc CInfoArea::indexToPixmap
             const QPixmap &indexToPixmap(int areaIndex) const override;
 
+            //! Get navigator component
+            BlackGui::Components::CNavigatorDockWidget *getNavigatorComponent();
+
         public slots:
             //! Navigator floating
             void toggleNavigator();