[SofaBaseTopology][SofaDeformable][SofaMiscTopology] Proper topological changes in SpringForceField

[alxbilger]

SpringForceField is updated to handle topological changes properly. It now uses callbacks.
A scene example is introduced to test topological changes on a SpringForceField. To make the example working, point removal was needed but not implemented. That is why I had to implement PointSetTopologyModifier::removeItems, and added the support of points in TopologicalChangeProcessor.

The use of callbacks fixes the application of the topological changes in SpringForceField. Before the use of callbacks, the topological changes were not applied because the force field was not in the same Node than the topology.

The new code also supports a change in both input topologies. Previously, changes only in the second topology were possible.

Without having testing it, I think the previous code did not handle properly multiple springs connected on a single DoF. This is now fixed.

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• it builds with SUCCESS for all platforms on the CI.
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• it does not generate new unit test failures.
• it does not generate new scene test failures.
• it does not break API compatibility.
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[alxbilger]

[ci-build][with-all-tests]