[TASK] Cleanup impexp

Change-Id: I8e542e3ce836cd45daa0cfd42b22da61ef721fab
Resolves: #45186
Releases: 6.1
Reviewed-on: https://review.typo3.org/18034
Reviewed-by: Alexander Opitz
Tested-by: Alexander Opitz
Reviewed-by: Christian Kuhn
Tested-by: Christian Kuhn