ENH: support different pixel types for the output image

Applications/Hyperspectral/otbHyperspectralUnmixing.cxx

Applications/Test/otbAllocateOutput.cxx

Applications/Test/otbCopyInput.cxx

Applications/Test/otbInternalReader.cxx

Applications/Util/otbExtractROI.cxx

Applications/Util/otbRescale.cxx

Applications/Util/otbSmoothing.cxx

Code/ApplicationEngine/otbWrapperApplication.cxx

Code/ApplicationEngine/otbWrapperApplication.h

.../ApplicationEngine/otbWrapperInputComplexImageParameter.h

Code/ApplicationEngine/otbWrapperInputImageListParameter.h

Code/ApplicationEngine/otbWrapperInputImageParameter.cxx

Code/ApplicationEngine/otbWrapperInputImageParameter.h

Code/ApplicationEngine/otbWrapperOutputImageListParameter.h

Code/ApplicationEngine/otbWrapperOutputImageParameter.cxx

Code/ApplicationEngine/otbWrapperOutputImageParameter.h

Code/ApplicationEngine/otbWrapperTypes.h

...licationEngine/otbWrapperOutputImageListParameterTest.cxx

.../ApplicationEngine/otbWrapperOutputImageParameterTest.cxx