Change the behavior of the RDF MAPPING section. Now, if the field type/widget is referring to another entity, then we will autocomplete on the list of owl:ObjectProperty from the ontologies. Otherwise, we will continue to display owl:DatatypeProperty and owl:AnnotationProperty to them.

The current field types/widgets that uses object properties are:

 (1) entityreference
 (2) Text with the struct_lookup_field widget
 (3) Text with the struct_lookup_field_with_scones_suggest widget