Feature/inheritance

[danovaro]

This PR introduces:

• strict validation is enforced by default
• introduced aliases for the verbs
• ability to specify subtypes and a context to asses which subtype has to be used (to handle tigge)
• metadata validation order is based on the canonical axis order, so that metadata used to match the context are already validated
• improved date parsing
• many tests derived from the mars-client migration suite (@tbkr)

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 91.05431% with 56 lines in your changes missing coverage. Please review.

Project coverage is 66.85%. Comparing base (6b41e2f) to head (1361547).

Files with missing lines	Patch %	Lines
src/metkit/mars/Type.cc	74.57%	15 Missing ⚠️
tests/test_expand.cc	93.42%	15 Missing ⚠️
src/metkit/mars/MarsLanguage.cc	87.03%	7 Missing ⚠️
src/metkit/mars/TypeDate.cc	83.33%	6 Missing ⚠️
tests/test_request.cc	88.00%	3 Missing ⚠️
src/metkit/mars/ContextRule.h	92.30%	2 Missing ⚠️
src/metkit/mars/TypeEnum.cc	90.00%	2 Missing ⚠️
tests/test_date.cc	91.30%	2 Missing ⚠️
src/metkit/mars/MarsRequest.cc	95.45%	1 Missing ⚠️
src/metkit/mars/Parameter.cc	0.00%	1 Missing ⚠️
... and 2 more

Additional details and impacted files

@@             Coverage Diff             @@
##           develop      #85      +/-   ##
===========================================
+ Coverage    65.90%   66.85%   +0.94%     
===========================================
  Files          122      124       +2     
  Lines         6983     7240     +257     
  Branches       667      708      +41     
===========================================
+ Hits          4602     4840     +238     
- Misses        2381     2400      +19     

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