[SofaDistanceGrid] Regression tests fail between different OS for some of the scenes in the plugin

[th-skam]

Problem

Description
The regression references produced by

• FFDDistanceGridCollisionModel-liver-DefaultAnimationLoop.scn
• FFDDistanceGridCollisionModel-liver-FreeMotionAnimationLoop.scn
• RigidDistanceGridCollisionModel-skull-FreeMotionAnimationLoop.scn

seem to be different depending on which compiler or OS was used to build and generate the reference files.

Most probably, the issues is related to STL components having different behaviour between OS. The scenes above both use the RegularGridTopology and SparseGridTopology.

That's an issue we might return to in the future.