Fixed issue with $refs being picked up in extensions.

[daveshanley]

extensions that contain references will not be parsed, they should not be parsed, unless you want them to, and then, well, so you can!

Now comes with a configurable switch in the config.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.63%. Comparing base (2b2d734) to head (1cfbf38).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #371   +/-   ##
=======================================
  Coverage   99.62%   99.63%           
=======================================
  Files         165      165           
  Lines       21553    21561    +8     
=======================================
+ Hits        21473    21483   +10     
+ Misses         75       73    -2     
  Partials        5        5           

Flag	Coverage Δ
unittests	99.63% <100.00%> (+<0.01%)	⬆️

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