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

Merging #180 (3f570e1) into master (1604340) will increase coverage by 0.48%.
The diff coverage is 85.31%.

@@             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     

Impacted Files	Coverage Δ
...java/com/nedap/archie/aom/ArchetypeConstraint.java	100.00% <ø> (ø)
.../main/java/com/nedap/archie/aom/ArchetypeHRID.java	79.48% <ø> (ø)
...main/java/com/nedap/archie/aom/CDefinedObject.java	80.00% <ø> (ø)
...om/src/main/java/com/nedap/archie/aom/CObject.java	81.98% <ø> (ø)
...in/java/com/nedap/archie/aom/CPrimitiveObject.java	66.66% <ø> (ø)
...java/com/nedap/archie/aom/OperationalTemplate.java	80.43% <ø> (ø)
.../com/nedap/archie/aom/ResourceDescriptionItem.java	100.00% <ø> (ø)
...java/com/nedap/archie/aom/primitives/CBoolean.java	34.78% <ø> (ø)
...in/java/com/nedap/archie/aom/primitives/CDate.java	80.00% <ø> (ø)
...ava/com/nedap/archie/aom/primitives/CDateTime.java	80.00% <ø> (ø)
... and 56 more

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