Version 1.39 Update

Description

• Updated to sync with 1.39 release of MaterialX.
• Update ORM extraction from glTF to MTLX to put in explicit extract nodes as channels for implicit extraction has been removed. Also remove this from the class and command line utility options.
• Jupyter notebook rerun with 1.39.
• glTF to MaterialX update rerun with addition of support files.
• Doc updates and usage of web based node editor previews.
• Note update to Python 11 for QuiltiX 6.0.1 compatibility.

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What's Changed

• 1.38.9 Release Update by @kwokcb in #13
• 1.39 update by @kwokcb in #16
• 1.39 cleanup by @kwokcb in #17

Full Changelog: v1.38.9...v1.39