[Mapping.NonLinear] A base class for (almost) all non linear mappings

[alxbilger]

The abstract class BaseNonLinearMapping is introduced. All mappings from the folder, except RigidMapping, inherit from BaseNonLinearMapping.

The class relies on the delegate pattern to simplify the implementation of non-linear mappings. All the affected mappings relied on the same design, so it made sense to factorize common code in a base class.

Breaking because I removed some aliases, made some methods final etc.

What I would like for a next work is to factorize the 3 methods buildGeometricStiffnessMatrix, applyDJT and updateK (if possible).

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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).

[bakpaul]

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