Imported dimensionality reduction module into OTB

CMakeLists.txt

...es/Applications/AppDimensionalityReduction/CMakeLists.txt

.../AppDimensionalityReduction/cbDimensionalityReduction.cxx

...ensionalityReduction/cbDimensionalityReductionTrainer.cxx

...mensionalityReduction/cbDimensionalityReductionVector.cxx

Modules/Learning/DimensionalityReduction/README.md

...arning/DimensionalityReduction/include/AutoencoderModel.h

...ning/DimensionalityReduction/include/AutoencoderModel.txx

...DimensionalityReduction/include/AutoencoderModelFactory.h

...mensionalityReduction/include/AutoencoderModelFactory.txx

...tyReduction/include/DimensionalityReductionModelFactory.h

...Reduction/include/DimensionalityReductionModelFactory.txx

...ityReduction/include/ImageDimensionalityReductionFilter.h

...yReduction/include/ImageDimensionalityReductionFilter.txx

Modules/Learning/DimensionalityReduction/include/PCAModel.h

...les/Learning/DimensionalityReduction/include/PCAModel.txx

...earning/DimensionalityReduction/include/PCAModelFactory.h

...rning/DimensionalityReduction/include/PCAModelFactory.txx

Modules/Learning/DimensionalityReduction/include/SOMModel.h

...les/Learning/DimensionalityReduction/include/SOMModel.txx