CHokuyoURG driver: non-optimal design

[jlblancoc]

The driver requests data to the data link (serial/TCP) on each call to doProcess(), and might drop an incomplete frame if an excessive delay exists in the middle of an incoming data frame (unlikely, but possible).

To-do:

• redesign the m_rx_buffer decoder code.
• make it robust against sensor power losses and restarts.

Connected to: #791

[jlblancoc]

One more thing: make it robust against sensor power losses and restarts.

[jlblancoc]

make it robust against sensor power losses and restarts.

Done with:

• c5884e1
• 1730c91
• 55b8d15