actuators/universal_robots: simplified directory structure
actuators/universal_robots/auto_initialization.cpp: fixed no return warning in remove_home_position
actuators/universal_robots: renamed applications (new prefix: ur-arm-)
actuators/universal_robots: removed str(t) from applications
actuators/universal_robots: removed impl_ namespace from ur-arm-control.cpp
actuators/universal_robots: removed unused namespace from ur-arm-control.cpp
actuators/universal_robots: simplified namespaces ( removed robotic_arm and arm )