- Lifecycle callbacks and listeners: Doctrine\Persistence LifecycleEventArgs,
  getObject()/getObjectManager() (getEntity()/getEntityManager() removed).
- ImportController: find() instead of merge() (removed) to re-attach the
  logged in user.
- Export iterator: Query::toIterable() instead of iterate() (removed).
- DQL StrToDate: TokenType instead of Lexer constants; ClassMetadata
  instead of ClassMetadataInfo.
- AdminExportTest: the adherent, prestataire and money purchase exports
  (CSV, JSON) are compared to a snapshot taken with the previous code.