Defer evaluation of a UserObject schema entirely to resolve #55

[jtv8]

Closes #55

Replaces class SchemaAnyRegisteredSubclass(SchemaAnyOf) with class UserObjectSchema(Schema), deferring the actual schema that a UserObject resolves to until it is used. This allows subclasses of the UserObject to be defined later, changing the resulting JSON schema (e.g. from a SchemaObject to a SchemaAnyOf, or adding additional options to a SchemaAnyOf).

[codecov]

Codecov Report

Merging #56 (58bbd7d) into master (4248f63) will increase coverage by 0.08%.
The diff coverage is 96.15%.

@@            Coverage Diff             @@
##           master      #56      +/-   ##
==========================================
+ Coverage   91.56%   91.65%   +0.08%     
==========================================
  Files          30       30              
  Lines         557      563       +6     
==========================================
+ Hits          510      516       +6     
  Misses         47       47              

Flag	Coverage Δ
unittests	91.65% <96.15%> (+0.08%)	⬆️

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Impacted Files	Coverage Δ
wysdom/user_objects/UserObject.py	96.29% <93.75%> (-1.75%)	⬇️
wysdom/__version__.py	100.00% <100.00%> (ø)
wysdom/mixins/RegistersSubclasses.py	97.72% <100.00%> (+0.35%)	⬆️
wysdom/mixins/__init__.py	100.00% <100.00%> (ø)
wysdom/object_schema/SchemaAnyOf.py	92.85% <100.00%> (+2.53%)	⬆️

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