[Mass] Remove DiagonalMass and replace with MeshMatrixMass (with lumping)

[hugtalbot]

This PR proposes to remove DiagonalMass and replace with MeshMatrixMass (with lumping) Fix #2452

One case remains to be covered: RigidTypes with non uniform vertex mass. A new PR is coming on this.

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Reviewers will merge this pull-request only if

• it builds with SUCCESS for all platforms on the CI.
• it does not generate new warnings.
• it does not generate new unit test failures.
• it does not generate new scene test failures.
• it does not break API compatibility.
• it is more than 1 week old (or has fast-merge label).

[epernod]

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