Update Case model, add contract field, drop cardNumber group, use new
dictionaries, add Maybe's for nullable fields.

Engine idents

refMExist (refExist for (Maybe Reference) fields, since References are
currently nullable)
New oldCRUD view for Case model, do not hide case services
Strip id when serving oldCRUD case view (f-me/carma#1530 workaround)
Port infoText metas from old case.js model