Rename sdk directory

SDK/CPP/private/room_impl.hpp

SDK/CPP/private/system.cpp

SDK/CPP/private/system_impl.hpp

SDK/CPP/public/CMakeLists.txt

SDK/CPP/public/LICENSE

SDK/CPP/public/README.md

SDK/CPP/public/include/voltu/defines.hpp

SDK/CPP/public/include/voltu/feed.hpp

SDK/CPP/public/include/voltu/initialise.hpp

SDK/CPP/public/include/voltu/observer.hpp

SDK/CPP/public/include/voltu/opencv.hpp

SDK/CPP/public/include/voltu/operator.hpp

SDK/CPP/public/include/voltu/pipeline.hpp

SDK/CPP/public/include/voltu/room.hpp

SDK/CPP/public/include/voltu/source.hpp

SDK/CPP/public/include/voltu/system.hpp

SDK/CPP/public/include/voltu/types/channel.hpp

SDK/CPP/public/include/voltu/types/errors.hpp

SDK/CPP/public/include/voltu/types/frame.hpp

SDK/CPP/public/include/voltu/types/image.hpp