This detects ordering issues with the `package` and `import` statements.
`library` is changed from package-specific to instead be generic between
the two, since structurally it's non-specific.
The next step would be to start exposing the results for the driver to
make ordering decisions for checking. That'll involve further
modifications to this code, but this felt like a reasonable change point
because it's the extent of the parser enforcement, and still causes
significant refactoring.
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Co-authored-by: Richard Smith <richard@metafoo.co.uk>
