User editable alttext and plot information rework

[NateLanza]

Does this PR close any open issues?

Closes #240 Closes #341

Give a longer description of what this PR addresses and why it's needed

This revamps the interface for plot information and adds the option for the user to edit the short and long alt texts. Still a WIP

Provide pictures/videos of the behavior before and after these changes (optional)

TODO

Have you added or updated relevant tests?

• [x] Yes
• [ ] No changes are needed

Have you added or updated relevant documentation?

• [ ] Yes
• [ ] No changes are needed

Are there any additional TODOs before this PR is ready to go?

TODOs:

• [x] Review UI in meeting (6/13)
• [x] Add tests
• [x] Provide pictures/video of behavior
• [ ] Check if external Upset docs need updating to describe alttext editability.

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