Handle Vocabulary rename on Document Type fields

• create a vocabulary "V"
• create a document type "T" and a field "F" associated to "V"
• rename "V" to "V2"

-> studio restarts

The field "F" is still associated to vocabulary "V" and no warning is displayed

Expected

• Studio should show a warning when a directory constraint references an unknown source

  Directory referenced in field [field name] can not be found in the Studio project.