Base: Rename Base::freecad_dynamic_cast into freecad_cast

This is to make it shorter and easier to use. QT does the same thing
with their qobject_cast.

src/Mod/PartDesign/Gui/ViewProvider.cpp

@@ -192,7 +192,7 @@ void ViewProvider::onChanged(const App::Property* prop) {
             for(App::DocumentObject* obj : body->Group.getValues()) {
 
                 if(obj->isDerivedFrom<PartDesign::Feature>() && obj != getObject()) {
-                   auto vpd = Base::freecad_dynamic_cast<Gui::ViewProviderDocumentObject>(
+                   auto vpd = freecad_cast<Gui::ViewProviderDocumentObject>(
                            Gui::Application::Instance->getViewProvider(obj));
                    if(vpd && vpd->Visibility.getValue())
                        vpd->Visibility.setValue(false);