use glvis module from glvis-js

[tomstitt]

Main Changes:

Uses the glvis module from glvis-js Updates widget.js to use new glvis.js features, renames to index.js Renames jupyter-glvis to glvis-jupyter Repackages with newer webpack to fix vulnerabilities Bumps version number to 0.2.0 Adds prettier as a dev dependency Renames python package to glvis from pyglvis

Todo:

• [x] Update glvis dependency and test once https://github.com/GLVis/glvis-js/pull/1 is merged

After merging:

• [ ] Push glvis-jupyter to npm
• [ ] Push glvis to PyPi
• [ ] Deprecate pyglvis on PyPi
• [ ] Deprecate jupyter-glvis on npm

[tomstitt]

I've tested this with JupyterLab 2.2.9 and JupyterNotebook 6.x.y and I believe it's ready to merge, please let me know if there are any last minute changes you'd like to see