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/App/GeoFeatureGroupExtension.cpp

@@ -285,7 +285,7 @@ std::vector<DocumentObject*> GeoFeatureGroupExtension::getScopedObjectsFromLink(
     }
 
     std::vector<App::DocumentObject*> result;
-    auto link = Base::freecad_dynamic_cast<PropertyLinkBase>(prop);
+    auto link = freecad_cast<PropertyLinkBase>(prop);
     if (link && link->getScope() == scope) {
         link->getLinks(result);
     }