ENH: Added orientation marker to slice view annotations
requested to merge github/fork/mehrtash/2935-Add-orientation-marker-to-sliceViewAnnotations into master
Created by: mehrtash
This will fix issue #2935 (http://na-mic.org/Mantis/view.php?id=2935).
Also:
- Refactoring slice view annotation code.
- Changed ScalarBar implementation:Instead of adding widget to the interacotor the scalarbar actor is directly added to the renderer. The previous implementation(widget) had conflicts with orientation marker renderer.