refactor(viz): landmark rework
Description
modules/viz/scene3d/adaptor/SLandmarks.cpp
is now fully able to manage landmarks, from addition to deletion, without a third party picker / manager (like modules/ui/qt/metrics/SLandmarks.hpp
).
- Some touch events management has also been fixed in the meanwhile.
- Allowed to force cpu backend for dicom writing
How to test it?
- Launch SightViewer -> nothing should have changed since it still relies on "old" behavior
- Launch a project where the new behavior is used (without a picker). Test it with touch interface.