IMUInverseKinematicsToolLive class should be modified to inherit OpenSim::IMUInverseKinematicsTool and/or OpenSim::InverseKinematicsToolBase

This is a reminder for the future. The OpenSim classes mentioned in the title are not available in the current stable build. Currently OpenSimLive uses its own class that doesn't inherit any other class, but is based on IMUInverseKinematicsTool. This should be fixed after the next stable release of OpenSim.