refactoring

src/motion_command/motion_command.h

src/motion_command/movec.cpp

src/motion_command/movec.h

src/motion_command/movej.cpp

src/motion_command/movej.h

src/motion_command/movel.cpp

src/motion_command/movel.h

src/motion_command/wait.cpp

src/motion_command/wait.h