Improve parsing of exceptions from ITK

[jmsmkn]

The exception messages from itk are now multiline, which result in unintelligible error messages when they're passed to grand challenge (see https://covid-segmentation.grand-challenge.org/FAQs/). These should be handled better.

[silvandeleemput]

I created some error catching methods specifically for SimpleITK (bodyct-multiview-nodule-detection), we could potentially use those to catch and reformat the SimpleITK exceptions

https://github.com/DIAGNijmegen/bodyct-multiview-nodule-detection/pull/95