RangeBearingSensor: line_style and poly_style are accepted but unused; animate the sensing beam and region #753

RangeBearingSensor.__init__ accepts line_style and poly_style and stores them as _line_style and _poly_style, but nothing reads them. They were meant to style the sensor beam and the sensing region polygon, which should be drawn and updated every time reading() is called, based on the robot's current configuration (the toolbox's MATLAB ancestor did this).

At present plot=True only displays the map and draws a line from the robot to the landmark observed (sensors.py, plot()); the range limit and the angular field of view are never shown.

• draw the sensing region (the sector between range and angle) as a polygon in poly_style, updated at each reading
• draw the beam to the observed landmark in line_style
• test with the Agg backend that the artists exist and move
• remove the "accepted but not currently used" note from the class docstring (added in docs(mobile): correct docstrings for the estimators, sensor, drivers and animations #750)

Deliberately left as is for now; this is the planned future work on animating the beam.

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