Virtual mode

Feature

• If you are driving without a real robot, use virtual mode.
• Selecting virtual mode sets the mode argument to virtual when running the dsr_aluncher launch file. If you omit the argument, it defaults to virsual.
  ex> roslaunch dsr_launcher single_robot_gazebo.launch mode:=virtual
• When ROS launches in virtual mode, the emulator(DRCF) runs automatically.
  - (DRCF) location: doosan-robot/common/bin/ DRCF
• One emulator is required for each robot.
• When controlling multiple robots, the emulator will automatically run as many as the number of robots and use different port.