Started to implement interface for transport

CMakeLists.txt

src/headset/headset.hpp

src/headset/remote_headset.cpp

src/headset/remote_headset.hpp

src/stream/types.hpp

src/transport/transport.cpp

src/transport/transport.hpp

src/transport/udp_packet.cpp

src/transport/udp_packet.hpp

src/transport/udp_transport.cpp

src/transport/udp_transport.hpp

src/types.hpp

src/utility/command_parser.cpp

src/utility/command_parser.hpp

src/utility/datagram.cpp

src/utility/datagram.hpp

src/utility/ring_buffer.cpp

src/utility/ring_buffer.hpp

src/vr_application.cpp

src/vr_application.hpp