InMoov PivPotentioV3 for rectangular potentiometer.

This is a modified version of PivPotenioV2 for the shoulder of Gael Langevin's InMoov robot. The newer HS-805BB servos have a rectangular potentiometer in place of the round pot in the older servos. This new PivPotentio will allow the newer pots to fit in shoulder's omoplate gearbox. It may also work for the RotPiventio for the bicep but I haven't tried that yet.