feat(viz): allow setting landmark "view" distance

Description

Specify on which slices the landmarks should be visible or not.

A new SLandmarks adaptor configuration has been added for that:

• `viewDistance="slicesInRange" → the landmarks will be visible on slices which "collide" with the landmarks spheres/cubes, depending on the size of the landmarks. It means a 10 sphere radius will be visible on 10 slices if each slice have a thickness of 1. This is the legacy behavior.
• `viewDistance="currentSlice" → the landmarks will only be visible on slices where they have been created. This is useful in 2D US cineloop "negato".
• `viewDistance="allSlices" → the landmarks will always be visible, regardless of the current slice.

...and many fixes concerning Landmarks visibility according to slice index

How to test it?

• add the configuration viewDistance="currentSlice"on a SLandmarks adaptor and check that the landmark is only visible on the slices where it has been created.