Merge branch 'functorfilter-take2' into 'develop'

Modules/Core/Functor/CMakeLists.txt

Modules/Core/Functor/include/otbFunctorImageFilter.h

Modules/Core/Functor/include/otbFunctorImageFilter.hxx

Modules/Core/Functor/include/otbVariadicAddFunctor.h

Modules/Core/Functor/include/otbVariadicConcatenateFunctor.h

Modules/Core/Functor/include/otbVariadicInputsImageFilter.h

.../Core/Functor/include/otbVariadicNamedInputsImageFilter.h

Modules/Core/Functor/otb-module.cmake

Modules/Core/Functor/test/CMakeLists.txt

Modules/Core/Functor/test/otbFunctorImageFilter.cxx

Modules/Core/Functor/test/otbFunctorTestDriver.cxx

Modules/Core/ImageBase/test/CMakeLists.txt