The class was used as a base class for plugin views but has been replaced with `QmitkAbstractView`.
We should remove all the remnants of `QmitkFunctionality` (inside `Plugins\org.mitk.gui.qt.common.legacy\src\`).
As far as I can see the only classes that are not updated are `QmitkIGTTrackingDataEvaluationView` and `QmitkIGTTrackingSemiAutomaticMeasurementView`.
All other files only contain strings / references to the class but do not use it anymore.
Some classes inside https://phabricator.mitk.org/diffusion/DIPP/repository/master/ need to be checked as well.