support for nested references

[dreisel]

This PR allows for nested references:
for example:

{
    "Nats": {
      "$ref": "common://nats",
      "RetryIntervalMs": {
        "$ref": "common://pool:PoolSize"
      }
    }
  }

[coveralls]

Pull Request Test Coverage Report for Build 374

• 6 of 6 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+1.2%) to 93.851%

---

Totals
Change from base Build 371:	1.2%
Covered Lines:	673
Relevant Lines:	706

---

💛 - Coveralls

[dreisel]

@JamesMessinger What do you think about this change?

[JamesMessinger]

Hi @dreisel. Thank you for your PR. Apologies for the long-delayed response 🙏

I like this new feature, and I don't see any problems with the code off-hand, but it definitely needs some tests. I recommend creating a test/specs/nested/nested.spec.js file and basically duplicating the contents & structure of the test/specs/external folder, but with some nested $refs to test your new functionality. Be sure to test nested $refs that point to external files as well as nested $refs that point to other locations in the same file.

[alex-y-su]

Hello, any news on this pull requests? If tests are only concerns I will create atoner pull requests with test. Thanks.

[philsturgeon]

@alexeysuvorov hello! 👋 No need for another pull request, you can push tests into this same branch and it'll update this PR.

Without those tests it's a little tricky for me to see what exactly is going on, which means it's hard to say if I have concerns or not. Can we make sure the change is working as you intended first then go from there?

[philsturgeon]

Closing for inactivity. If you can bung some tests into this PR that would help us get this merged.