Merge branch 'libsgm' into 'master'

CMakeLists.txt

components/operators/CMakeLists.txt

lib/libsgm/CMakeLists.txt

lib/libsgm/FindLibSGM.cmake

lib/libsgm/LICENSE

lib/libsgm/README.jp.md

lib/libsgm/README.md

lib/libsgm/include/libsgm.h

lib/libsgm/include/libsgm_config.h

lib/libsgm/include/libsgm_config.h.in

lib/libsgm/include/libsgm_wrapper.h

lib/libsgm/sample/benchmark/CMakeLists.txt

lib/libsgm/sample/benchmark/stereosgm_benchmark.cpp

lib/libsgm/sample/image/CMakeLists.txt

lib/libsgm/sample/image/stereosgm_image.cpp

lib/libsgm/sample/image_cv_gpumat/CMakeLists.txt

...bsgm/sample/image_cv_gpumat/stereosgm_image_cv_gpumat.cpp

lib/libsgm/sample/movie/CMakeLists.txt

lib/libsgm/sample/movie/stereosgm_movie.cpp

lib/libsgm/sample/reprojection/CMakeLists.txt