[WIP] PR: Add post_mortem to runcell calls for "run current cell" action

[stevetracvc]

Description of Changes

When the user uses the "run current cell" action, enter postmortem on an error if the user has set the run config "Directly enter debugging when errors appear".

• Wrote at least one-line docstrings (for any new functions)
• Added unit test(s) covering the changes (if testable)

• Included a screenshot or animation (if affecting the UI, see Licecap)

output.mp4

I added the post_mortem flag to the runcell call for the "run current cell" or "run current cell and go to the next one" action. This value is read from the user's settings. I often run my programs cell by cell, so it's convenient to drop into debug mode if there's an error somewhere in the cell. Also, it seems more consistent for the "run" and "run current cell" actions to have similar behavior.

I feel like there might be a better location to read the config setting, which is why I flagged this as WIP.

Issue(s) Resolved

Fixes #

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stevetracvc