ENH: Deep refactoring of VegetationIndices Functor and Filter interfaces. All filter now derive from itk Functor filter, and base functor classes are available to provide full support of either VectorImage with UnaryFunctorImageFilter or Image with BinaryFunctorImageFilter or TernaryFunctorImageFilter

COMP: Refactoring the TARGET_LINK_LIBRARIES. Any executable must can now link only with OTBIO and eventually with a thematic library

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