In DICOM plugin, remove link-time dependency to auto-load DicomRTIO module
- Add check against auto-load dependencies that was introduced for modules in T26980 resp. D224 also to plugins
- Remove auto-load dependency to DicomRTIO
- Use FileReaderRegistry to indirectly access DicomRTIO services in DICOM plugin
Test Plan: I manually loaded our RTStruct, RTDose, and RTPlan test datasets through the DICOM plugin.
Maniphest Tasks: T27243
Differential Revision: https://phabricator.mitk.org/D266