Implement Vector Protocol in ROS Adapter Node

[reuank]

The Rover Navigation Protocol (RNP) messages, defined in the RoverControl.msg, have to be translated to actual driving commands, defined in MotorControl.msg.

[heyegross]

Main functionality is there, testing, visualisation and improvement needs to be done

[reuank]

Please do not close issues unless the functionality that has been implemented was tested. Thanks!