7.6.2pre7

Many changes including:

scene.capture handles label text
Added isjupyterlab_vpython check …
Update glowcomm.js …
Update glowcommlab.js …
Delete package-lock.json …
Updated for JupyterLab 2 and 3 …
Delete some unused code from the glowcomm files
Fix bug in moidyfing menu choices
Improve extrusion error reporting
Update extrusion object
Bump y18n from 4.0.0 to 4.0.1 in /labextension/vpython …
Bump elliptic from 6.5.3 to 6.5.4 in /labextension/vpython …
Remove spurious backtick on README.md
Correct typo in the clone machinery
Fix miniconda setup
Update to latest version of miniconda action
cannot copy object, need to copy attrs
let cython know that we are using python3.
remove debug line
fix up line endings