Deprecate the unused AttributedCodeListing type

[d-ronnqvist]

Bug/issue #, if applicable:

Summary

This removes the AttributedCodeListing type that isn't used for anything. There's no way for developers to pass this form of code listings to DocC (unless they use some other tool that imports the SwiftDocC module). AttributedCodeListing.Line appears in public API DocumentationNode.Name.symbol but DocC only ever creates symbol name values with a single plain text token.

Note, AttributedCodeListing is a feature that was superseded by Snippets and has never been available via the docc command line tool.

Dependencies

None.

Testing

This is a non-functional change. Everything should continue to behave as before. There's nothing in particular to test.

Checklist

Make sure you check off the following items. If they cannot be completed, provide a reason.

• Added Updated tests
• Ran the ./bin/test script and it succeeded
• Updated documentation if necessary Not applicable

[d-ronnqvist]

@swift-ci please test

[anferbui]

I'm not too familiar with the nuances of the type that is being deprecated so I'm not comfortable approving, but the code does look correct to me.

[d-ronnqvist]

@swift-ci please test

[d-ronnqvist]

I'm not too familiar with the nuances of the type that is being deprecated so I'm not comfortable approving, but the code does look correct to me.

I think @franklinsch is probably the only other person on the team who remembers this type 😄

[anferbui]

Awesome, looks good to me!

[d-ronnqvist]

@swift-ci please test