Adds full support for Overlays! #125

[daveshanley]

Overlays can now be built and applied to libopenapi documents.

[codecov]

Codecov Report

❌ Patch coverage is 99.10913% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 99.59%. Comparing base (e247a28) to head (afbed47).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
overlay.go	92.15%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #492      +/-   ##
==========================================
- Coverage   99.60%   99.59%   -0.01%     
==========================================
  Files         179      189      +10     
  Lines       22013    22462     +449     
==========================================
+ Hits        21926    22371     +445     
- Misses         55       57       +2     
- Partials       32       34       +2     

Flag	Coverage Δ
unittests	99.59% <99.10%> (-0.01%)	⬇️

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