wip: [enrichment] Support of object references
wip: [enrichment] Support of object references

- Handling the references between objects and
  attributes or objects that are displayed in the
  form and saving them.
- Avoiding issue when an attribute or object can
  not be saved and is referenced: trying to find
  in the event if it is an attribute, returning
  a warning message if it is an object or if
  nothing corresponding to the failing referenced
  object or attribute is found.

MISP/MISP,MISP/MISP,SteveClement/MISP,SteveClement/MISP,FIRSTdotorg/MISP,FIRSTdotorg/MISP,SteveClement/MISP,FIRSTdotorg/MISP,MISP/MISP,SteveClement/MISP,MISP/MISP,SteveClement/MISP,MISP/MISP,FIRSTdotorg/MISP