detectmissing: init

[9999years]

Description

This lets users detect missing files and albums, in case they've deleted files outside of beet remove -d.

The UI could use a bit more polish, but how's the concept look? Happy to clean this up if you're interested in it.

To Do

• [ ] Documentation. (If you've added a new command-line flag, for example, find the appropriate page under docs/ to describe it.)
• [ ] Changelog. (Add an entry to docs/changelog.rst to the bottom of one of the lists near the top of the document.)
• [ ] Tests. (Very much encouraged but not strictly required.)

[github-actions[bot]]

Thank you for the PR! The changelog has not been updated, so here is a friendly reminder to check if you need to add an entry.

[codecov[bot]]

Codecov Report

:x: Patch coverage is 3.03030% with 32 lines in your changes missing coverage. Please review. :white_check_mark: Project coverage is 63.61%. Comparing base (5beb3d1) to head (e5e3f30).

Files with missing lines	Patch %	Lines
beetsplug/detectmissing.py	0.00%	32 Missing :warning:

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