Made a dashboard widget that displays the robot's position calculated by PositioningSubsystem.
Problems:
-There is an occasional NaN in the calculation of the rate in PositioningSubsystem. I changed ChassisSubsystem.getAverageRate() to change a NaN to 0, but this is still not a permanent fix.
-When rotating and moving at the same time, anglePosition develops a small gain. Don't know if this can be fixed because the angle being sent to the dashboard is taken directly from the gyro.