Script that allows interactive editing of the slit/order edges

[kbwestfall]

As titled. See changes to doc/calibrations/slit_tracing.rst for a description of the script.

I'm directing to the hires_trace_orders branch because I branched from there. Will redirect once that PR clears.

I should add some tests, and it would be useful for one or more volunteers to take this for a test drive.

[codecov-commenter]

Codecov Report

Attention: 268 lines in your changes are missing coverage. Please review.

Comparison is base (36ceb88) 40.98% compared to head (7828a5e) 40.74%.

Files	Patch %	Lines
pypeit/core/gui/edge_inspector.py	0.00%	133 Missing ⚠️
pypeit/core/gui/gui_util.py	0.00%	116 Missing ⚠️
pypeit/scripts/edge_inspector.py	30.43%	16 Missing ⚠️
pypeit/edgetrace.py	40.00%	3 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1713      +/-   ##
===========================================
- Coverage    40.98%   40.74%   -0.24%     
===========================================
  Files          190      193       +3     
  Lines        43904    44180     +276     
===========================================
+ Hits         17994    18003       +9     
- Misses       25910    26177     +267     

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[rcooke-ast]

This is really impressive @kbwestfall! The structure of the GUI is really clear, and much better organised than what I previously implemented in identify, skysub_regions, and object_find. Eventually, we should aim to migrate these over to the same structure that you've setup to make all GUI codes a bit easier to manage in the long run.

I have mostly minor comments, but I'm a little confused why there are some unused arguments being passed to some functions (including a few *args and **kwargs as well). In some cases, there doesn't appear to be any inheritance, and I can't understand why they are needed... I'm certain that I'm about to learn something new in python that I didn't know before!

Without major comments, I'm approving - thanks again! 👍

[rcooke-ast]

Now actually approving...

[kbwestfall]

Thanks @rcooke-ast ! I've written a few of these now and stackoverflow is key!

On the argument lists, as you'll see in my responses, some of these were pure laziness and others were restrictions to the required calling sequence for cursor events.

[debora-pe]

Solid! Thanks @kbwestfall!