0.6.0: Model Warping (Beta), and many related improvements!

0.6.0 is a larger release that focuses on making the workflow around mesh and model warping easier. This is to support two new end-to-end tutorials that we have added to the documentation: "Make a Lower Leg" and "The Model Warper". Those tutorials outline an OpenSim Creator workflow to create an OpenSim model from scratch and warp it non-linearly.

See CHANGELOG.md for a full list of changes in 0.6.0 (23 changes).