Rename sdk directory

CMakeLists.txt

SDK/C++/public/ext/pybind11

SDK/CPP/CMakeLists.txt

SDK/CPP/private/feed_impl.cpp

SDK/CPP/private/feed_impl.hpp

SDK/CPP/private/frame_impl.cpp

SDK/CPP/private/frame_impl.hpp

SDK/CPP/private/image_impl.cpp

SDK/CPP/private/image_impl.hpp

SDK/CPP/private/observer_impl.cpp

SDK/CPP/private/observer_impl.hpp

SDK/CPP/private/operator_impl.cpp

SDK/CPP/private/operator_impl.hpp

SDK/CPP/private/pipeline_impl.cpp

SDK/CPP/private/pipeline_impl.hpp

SDK/CPP/private/pointcloud_impl.cpp

SDK/CPP/private/pointcloud_impl.hpp

SDK/CPP/private/property_impl.cpp

SDK/CPP/private/property_impl.hpp

SDK/CPP/private/room_impl.cpp