Fixed Dashboard errors caused by IOStuff

Summary:
Signed-off-by: Clemens Hentschke <c.hentschke@dkfz-heidelberg.de>

Fix for PreferenceListReaderOptionsFunctorTest

Signed-off-by: Clemens Hentschke <c.hentschke@dkfz-heidelberg.de>

removed unneeded file

Signed-off-by: Clemens Hentschke <c.hentschke@dkfz-heidelberg.de>

Fix for GCC

Signed-off-by: Clemens Hentschke <c.hentschke@dkfz-heidelberg.de>

Merge branch 'T22539-RTStructureSetReaderLinuxFix'

Test Plan: at least CEST, RTIO and PreferenceListReaderOptionsFunctorTest run through

Reviewers: O1 MITK Core, kislinsk

Reviewed By: O1 MITK Core, kislinsk

Differential Revision: https://phabricator.mitk.org/D58