Fix type hierarchy comparisons of types no longer visible in API #252
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Description
When types are no longer part of the public API but are needed to derive the type relation (like to find our if the new type is wider / narrower as the old one) then the type hierarchy used to calculate that information did no longer know about the type and its relations.
This PR merges the TypeHierarchy by taking all types not known in the new TypeHierarchy from the old one.
Type of Change
Fixes #251