Remove unused parameter
Clean class and replace the custom event listener
A SimpleMemberCommand can be used instead to make the code simpler.
Additionally the setter has been moved to the class implementation.
Unused class members have been removed.
- test navigation inside StdDisplay
- observe crosshair movement and image navigator
- scroll, move slider
Subscribers: floca, kalali, kislinsk
Maniphest Tasks: T29289
Differential Revision: https://phabricator.mitk.org/D720