Generalizing terminology

[blast-hardcheese]

• swagger -> spec in most value and type positions
• SwaggerUtil methods have been recategorized (see ModelResolver and PropMeta)
• SwaggerUtil has been deleted (🎉)

[codecov]

Codecov Report

Attention: 20 lines in your changes are missing coverage. Please review.

Comparison is base (34957b4) 82.41% compared to head (401b43c) 82.27%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1825      +/-   ##
==========================================
- Coverage   82.41%   82.27%   -0.15%     
==========================================
  Files          93       93              
  Lines        7370     7310      -60     
  Branches      859      829      -30     
==========================================
- Hits         6074     6014      -60     
  Misses       1296     1296              

Files	Coverage Δ
...s/core/src/main/scala/dev/guardrail/ReadSpec.scala	77.77% <ø> (ø)
...main/scala/dev/guardrail/core/CoreTermInterp.scala	78.48% <100.00%> (ø)
...re/src/main/scala/dev/guardrail/core/Tracker.scala	91.30% <100.00%> (ø)
...a/dev/guardrail/core/extract/VendorExtension.scala	100.00% <ø> (ø)
...a/dev/guardrail/generators/LanguageParameter.scala	97.95% <100.00%> (ø)
...la/dev/guardrail/generators/SwaggerGenerator.scala	78.23% <100.00%> (+3.03%)	⬆️
...dev/guardrail/generators/spi/CoreTermsLoader.scala	100.00% <ø> (ø)
...n/scala/dev/guardrail/runner/GuardrailRunner.scala	88.88% <ø> (ø)
...yncHttpClient/AsyncHttpClientClientGenerator.scala	94.23% <ø> (ø)
...rs/java/dropwizard/DropwizardServerGenerator.scala	95.66% <ø> (ø)
... and 14 more

... and 4 files with indirect coverage changes

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