Fix windows paths and external refs

[jonluca]

Adding in the code to fix some path issues and some relative paths.

This doesn't fully address #200 - we really need a more updated test schema.

I imported a majority of the code from that PR, though, and will take a look at some point in the future.

#315 windows absolute paths should be included here

[coveralls]

Pull Request Test Coverage Report for Build 6228842548

• 57 of 69 (82.61%) changed or added relevant lines in 8 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.2%) to 95.973%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
lib/util/convert-path-to-posix.ts	9	11	81.82%
lib/util/url.ts	28	38	73.68%

Totals
Change from base Build 4069430371:	0.2%
Covered Lines:	3202
Relevant Lines:	3294

---

💛 - Coveralls

[sukeshpabolu]

ok

[github-actions]

🎉 This PR is included in version 11.0.0 🎉

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