New feature: Angle source and representation
Add a new Protractor
source that has the same goal that the Ruler
but this time for angles.
It is controlled via 3 points that can also be placed using an interactive picker.
Relies on vtkAngleRepresentation2D to display the angle when applying the filter.
needs: vtk/vtk!9649 (merged)
Edited by Timothee Chabat