Remove unused disparity algorithms

components/operators/src/disparity/optflow_smoothing.cpp

components/rgbd-sources/CMakeLists.txt

components/rgbd-sources/include/ftl/offilter.hpp

components/rgbd-sources/src/algorithms/consistency.cu

components/rgbd-sources/src/algorithms/elas.cpp

components/rgbd-sources/src/algorithms/elas.hpp

components/rgbd-sources/src/algorithms/fixstars_sgm.cpp

components/rgbd-sources/src/algorithms/fixstars_sgm.hpp

components/rgbd-sources/src/algorithms/nick.cpp

components/rgbd-sources/src/algorithms/nick.hpp

components/rgbd-sources/src/algorithms/nick1.cu

components/rgbd-sources/src/algorithms/opencv_bm.cpp

components/rgbd-sources/src/algorithms/opencv_bm.hpp

components/rgbd-sources/src/algorithms/opencv_cuda_bm.cpp

components/rgbd-sources/src/algorithms/opencv_cuda_bm.hpp

components/rgbd-sources/src/algorithms/opencv_cuda_bp.cpp

components/rgbd-sources/src/algorithms/opencv_cuda_bp.hpp

components/rgbd-sources/src/algorithms/opencv_cuda_csbp.cpp

components/rgbd-sources/src/algorithms/opencv_cuda_csbp.hpp

components/rgbd-sources/src/algorithms/opencv_sgbm.cpp