First version of a working open API model generator

[pieterbos]

Very much draft/experimental OpenAPI model generator. Few problems still:

• multiple inheritance ONLY takes into account the first ancestor. Needs fixing
• do we need oneOf references to indicate which subclasses are to be used, or is it ok as is?
• do we need explicity type property mappings?

TODO:

• fix the maps in ResourceDescription. It's now excluded from the RM, which is fine, but a reference to a single base file would be even better, so it needs to be correct for the AOM anyway.

[codecov]

Codecov Report

Attention: Patch coverage is 85.31073% with 104 lines in your changes missing coverage. Please review.

Project coverage is 71.01%. Comparing base (1604340) to head (3f570e1).
Report is 406 commits behind head on master.

Files with missing lines	Patch %	Lines
.../com/nedap/archie/openapi/OpenAPIModelCreator.java	87.28%	26 Missing and 11 partials ⚠️
...archie/openapi/ModelInfoLookupToPBmmConverter.java	88.27%	7 Missing and 10 partials ⚠️
.../java/com/nedap/archie/json/JSONSchemaCreator.java	85.89%	7 Missing and 4 partials ⚠️
...ava/com/nedap/archie/json/JsonSchemaValidator.java	60.71%	11 Missing ⚠️
...nedap/archie/rminfo/ReflectionModelInfoLookup.java	60.00%	5 Missing and 5 partials ⚠️
...a/com/nedap/archie/rminfo/ArchieAOMInfoLookup.java	50.00%	7 Missing and 2 partials ⚠️
...main/java/com/nedap/archie/json/JsonSchemaUri.java	78.57%	0 Missing and 3 partials ⚠️
.../bmm/v2/validation/converters/BmmModelCreator.java	86.66%	0 Missing and 2 partials ⚠️
...va/com/nedap/archie/openapi/RedefinedProperty.java	83.33%	2 Missing ⚠️
...com/nedap/archie/json/flat/AttributeReference.java	0.00%	1 Missing ⚠️
... and 1 more

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #180      +/-   ##
============================================
+ Coverage     70.53%   71.01%   +0.48%     
- Complexity     6489     6693     +204     
============================================
  Files           640      645       +5     
  Lines         21662    22301     +639     
  Branches       3485     3586     +101     
============================================
+ Hits          15279    15838     +559     
- Misses         4755     4798      +43     
- Partials       1628     1665      +37     

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