HaViMo2 purge

Purged the HaViMo2 functions and files from the core library.  A replacement using the Dxl object has been created and compiles, but has not yet been tested with CM-900 and HaViMo2 hardware.  When I've confirmed it works as expected, then I will push the updated dxl library and havimo2 example sketch.  I also need to see if the changes to the pypose sketch permit it to work seamlessly with PyPose (a bit like RoboPlus Motion for creating motions).