Add 3 new indicators to the UI to show the status of G2 polling and logging.

Each indicator corresponds to one of the existing polling loggers. For reference, here are the logger names and endpoints:

• "Acoustic", endpoint is /api/v1/position/acoustic/filtered
• "Vessel position" /api/v1/position/master
• "Vessel orientation" /api/v1/imu/calibrate

The text and color of each indicator should be as follows:

• grey with text "{logger_name} logging disabled" if the --poll_rate argument is <= 0.
• yellow with text "{logger_name} logging enabled" if the --poll_rate argument is > 0, but polling has not been attempted for that logger.
• red with the text "{logger_name} polling failed; is the bridge up?" if the --poll_rate argument is > 0, and the most recent polling attempt failed for that logger.
• green with text "{logger_name}: {data}" if the --poll_rate argument is > 0, and the most recent polling attempt succeeded for that logger.

The data shown depends on the logger:

• Acoustic: show the 4 receiver distances
• Vessel position: lat, lon, orientation
• Vessel orientation: roll, pitch, yaw