Issue #519

[daveshanley]

Adds a new SkipExternalRefResolution flag to the document config that prevents the rolodex or the resolver from engaging with external files or URLs, leaving external refs unresolved or untouched in the model.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.56%. Comparing base (cebe7f6) to head (b480394).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #522      +/-   ##
==========================================
- Coverage   99.56%   99.56%   -0.01%     
==========================================
  Files         192      192              
  Lines       23771    23867      +96     
==========================================
+ Hits        23668    23762      +94     
- Misses         62       63       +1     
- Partials       41       42       +1     

Flag	Coverage Δ
unittests	99.56% <100.00%> (-0.01%)	⬇️

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