Remove UnaryFunctorImageFilter

Summary

Replace UnaryFunctorImageFilter by FunctorImageFilter.

Rationale

This is a step of issue #1821 (closed). The class UnaryFunctorImageFilter has been removed and all its instance/derived class have been replaced by FunctorImageFilter.

Copyright

The copyright owner is CNES and has signed the ORFEO ToolBox Contributor License Agreement.

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Check before merging:

• All discussions are resolved
• At least 2 votes from core developers, no vote.
• The feature branch is (reasonably) up-to-date with the base branch
• Dashboard is green
• Copyright owner has signed the ORFEO ToolBox Contributor License Agreement