Refactor directory structure and module names

vision/include/ftl/calibrate.hpp

vision/include/ftl/cuda_algorithms.hpp

vision/include/ftl/cuda_common.hpp

vision/include/ftl/disparity.hpp

vision/include/ftl/display.hpp

vision/include/ftl/local.hpp

vision/include/ftl/middlebury.hpp

vision/include/ftl/streamer.hpp

vision/include/ftl/synched.hpp

vision/lib/CMakeLists.txt

vision/lib/elas/descriptor.cpp

vision/lib/elas/descriptor.h

vision/lib/elas/elas.cpp

vision/lib/elas/filter.cpp

vision/lib/elas/filter.h

vision/lib/elas/matrix.cpp

vision/lib/elas/matrix.h

vision/lib/elas/triangle.cpp

vision/lib/elas/triangle.h

vision/src/algorithms/consistency.cu