Implement algorithm to remove deleted resources from a project

Needed for https://gitlab.com/mpapp-private/manuscripts-api/merge_requests/322

@alf-eaton I need some help figuring out how to export or build this. From what I can see in the other test files, I should be able to do something like const { selectActiveResources } = require('../dist/cjs') but I'm not sure how that works?

Other than that ready for review.