TD: modernize C++: replace 'typedef' with 'using'

src/Mod/TechDraw/Gui/MDIViewPage.h

@@ -121,7 +121,7 @@ protected:
     
     void onDeleteObject(const App::DocumentObject& obj);
 
-    typedef boost::signals2::connection Connection;
+    using Connection = boost::signals2::connection;
     Connection connectDeletedObject;
 
     bool compareSelections(std::vector<Gui::SelectionObject> treeSel,QList<QGraphicsItem*> sceneSel);

src/Mod/TechDraw/Gui/ViewProviderCosmeticExtension.h

@@ -42,7 +42,7 @@ public:
     virtual QIcon extensionMergeGreyableOverlayIcons(const QIcon & orig) const override;
 };
 
-typedef Gui::ViewProviderExtensionPythonT<TechDrawGui::ViewProviderCosmeticExtension> ViewProviderCosmeticExtensionPython;
+using ViewProviderCosmeticExtensionPython = Gui::ViewProviderExtensionPythonT<TechDrawGui::ViewProviderCosmeticExtension>;
 
 } //namespace TechDrawGui
 

src/Mod/TechDraw/Gui/ViewProviderDrawingView.h

@@ -82,7 +82,7 @@ public:
     void onProgressMessage(const TechDraw::DrawView* dv,
                          const std::string featureName,
                          const std::string text);
-    typedef boost::signals2::scoped_connection Connection;
+    using Connection = boost::signals2::scoped_connection;
     Connection connectGuiRepaint;
     Connection connectProgressMessage;
 

src/Mod/TechDraw/Gui/ViewProviderPage.h

@@ -82,7 +82,7 @@ public:
 
     //slots & connections
     void onGuiRepaint(const TechDraw::DrawPage* dp); 
-    typedef boost::signals2::scoped_connection Connection;
+    using Connection = boost::signals2::scoped_connection;
     Connection connectGuiRepaint;
 
     void unsetEdit(int ModNum) override;