Fixes for Philipp's comments:
When working with it we noticed two things that would make working with it much more comfortabl for the 3D segmentations:

- A button to reset the 3D segmentation in the middle to the same orientation as the anatomical image on the right (its original position).

- When hitting one of the buttons on the left (like mark as noise) the selected intensity for the anatomical image is reset. This should be switched of.