Fixed RobotModeData and MasterboardData parsing for UR firmware v3.0.

Added missing field in RobotModeData and undocumented field in MasterboardData for UR firmware v3.0.
Since the code complained about invalid packet length (72 instead of 68), I dumped the packet contents and compared it the documentation. Except for the 4 zero-bytes in the beginning (directly after the header) all other values made sense, so I assume a new undocumented field was added (or 2-4 smaller fields). Let's just hope the new field is a version number and UR forgot to update the documentation ;-)