enable CdmPopupEditors to operate on CdmDecoratorDTOs
Decorator-DTOs are wrappers (decorator pattern) applied to cdm entities to let the entities appear as DTO. Internally these are no real DTOs, but his patter allows us to consistently and quickly get DTO like beans to be used in editors.
CdmPopupEditors should be able to operate also on cdn entities and on CdmDecoratorDTOs. This task involves the creation of a base class for all CdmDecoratorDTOs and some refactoring of the PopupEditor mvp framework.