Instagrain v0.2 release - case v3; Software and Model v0.2

[ebgoldstein]

This is a minor update from the first release.

Improvements include:

• new case designs (v3 - smaller, no coral, fewer cuts)
• notebook for new model, based on new training samples
• new .tflite model
• software enhancements (load a previous session)
• Zenodo DOI for release.

This should be considered an Alpha level release - more testing is needed for hardware, software, and the ML model.

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This discussion was created from the release Instagrain prototype - case v3; Software and Model v0.2.