Refactor directory structure and module names

vision/src/algorithms/elas.cpp

vision/src/algorithms/fixstars_sgm.cpp

vision/src/algorithms/nick.cpp

vision/src/algorithms/nick1.cu

vision/src/algorithms/opencv_bm.cpp

vision/src/algorithms/opencv_cuda_bm.cpp

vision/src/algorithms/opencv_cuda_bp.cpp

vision/src/algorithms/opencv_cuda_csbp.cpp

vision/src/algorithms/opencv_sgbm.cpp

vision/src/algorithms/rtcensus.cpp

vision/src/algorithms/rtcensus.cu

vision/src/algorithms/rtcensus_sgm.cpp

vision/src/algorithms/rtcensus_sgm.cu

vision/src/algorithms/sparse_census.cu

vision/src/algorithms/tex_filter.cu

vision/src/calibrate.cpp

vision/src/disparity.cpp

vision/src/display.cpp

vision/src/local.cpp

vision/src/main.cpp