Improve the Domain Modeler display

When we create an entity (ChildrenEntity) that inherits from another (generalization) (ParentEntity), two pieces of information are not visible concerning the inherited entity: the relationships that its parent has as well as these event handlers. This is more important when your domain is split between multiple modules.

(2) By not displaying this information I have noticed that developers tend to recreate the links (duplication) at the level of the inherited object. In this example we have ChildrenEntity_RelatedEntity duplicated regarding the ParentEntity_RelationEntity (if there is no valuable reason to do it) .

(1) Furthermore, when there are existing event handlers at the general entity level, we do not have this visibility. The reflex to validate at the parent level is not innate. This is important because the order in which the event handlers are executed is not guaranteed.