uORB add ORB_COMMUNICATOR define to enable remote uORB

cmake/configs/posix_eagle_hil.cmake

cmake/configs/posix_eagle_muorb.cmake

cmake/configs/posix_sdflight_default.cmake

cmake/configs/posix_sdflight_legacy.cmake

cmake/configs/posix_sitl_default.cmake

cmake/configs/qurt_eagle_hil.cmake

cmake/configs/qurt_eagle_muorb.cmake

cmake/configs/qurt_eagle_travis.cmake

cmake/configs/qurt_sdflight_default.cmake

cmake/configs/qurt_sdflight_legacy.cmake

platforms/posix/cmake/sitl_tests.cmake

src/modules/uORB/uORBDevices.cpp

src/modules/uORB/uORBDevices.hpp

src/modules/uORB/uORBManager.cpp

src/modules/uORB/uORBManager.hpp