MNT: Compatibility with Ginga v4

[pllim]

Description

This pull request is to address compatibility issues with upcoming Ginga v4 release. This is a major release and includes some breaking changes.

Since I am handing this repository to @kulpster85 , he might have to take over this PR and finish it.

Blocked by

• https://github.com/spacetelescope/stginga/issues/227

TODO

• [ ] Find other incompatibilities and add their fixes here. Go through examples in https://wss-tools.readthedocs.io/en/latest/wss_tools/quip/index.html#using-quip and try out the custom plugins.
• [ ] Make sure these fixes are backward-compatible with older Ginga that QUIP supports (e.g., you might need to check for Ginga version before picking which code to use). Alternatively, you can also bump minversion of supported Ginga in setup.cfg and not have to worry about backward compatibility.

If you decide to not ever use Ginga v4 (i.e., pin your maxversion to v3, then there is no need for this PR but you also will not get any new Ginga fixes or features).

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