Use mpl-interactions for zoom_factory, panhandler, and image_segmenter

[ianhi]

All three of those functions were ultimately extracted and new improved versions of them live in the pip installable library mpl-interactions in this file: https://github.com/ianhi/mpl-interactions/blob/master/mpl_interactions/generic.py

They are documented:

• https://mpl-interactions.readthedocs.io/en/stable/examples/image-segmentation.html
• https://mpl-interactions.readthedocs.io/en/stable/examples/zoom-factory.html

This project should make use of those functions as they have a few improvements and will continue to be actively maintained.

If anyone sees this and wants to try you are more than welcome to open a PR (even if you didn't fully finish the process and need some help)