[All] Remove deprecated calls and warnings

[fredroy]

Cleaning PR for the v21.06 release.

1. remove warnings about unused variables/parameters
2. transformRotation of Mat enforces if the given Mat is 3x3 or 4x4 (does not make sense otherwise, or could even crash)
3. add a function toHomogeneousMatrix() for Mat4x4 for RigidTypes (which will use the toHomogenous of Quat)
4. remove uses of operator= with MultiMatrix in ODESolvers
5. HeadlessRecorder was using a deprecated feature of VisualParameters (sceneTransform)
6. Use PathResolver in MultiMapping
7. Rename Deprecation Macro in BaseData.h, correct the fix message and remove use of setOwnerClass.

Note for 7.: the GUI was displaying either "Base" for owner (when hovering on the Data name) or "no owner found". I dont really know what was supposed to be displayed.
Now with the correction, all the Data will display their owner's name, which seems a bit useless to me.

Before:

After:

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By submitting this pull request, I acknowledge that
I have read, understand, and agree SOFA Developer Certificate of Origin (DCO).

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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).

[guparan]

Forgive me @fredroy, I savagely used your branch to add a clean commit in Sofa.Config 👼

[fredroy]

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