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 The class UnaryFunctorImageFilter has been removed and all its instance/derived class have been replaced by FunctorImageFilter.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.
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
