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.cpp

@@ -57,6 +57,11 @@ namespace BlackGui
             }
         }
 
+        CNavigatorDockWidget *CInvisibleInfoAreaComponent::getNavigatorComponent()
+        {
+            return this->ui->comp_Navigator;
+        }
+
         void CInvisibleInfoAreaComponent::toggleNavigator()
         {
             this->ui->comp_Navigator->toggleFloating();