uber / NullAway / #906
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Make library models override annotations by default. (#636)

This change removes the short-lived `AcknowledgeLibraryModelsOfAnnotatedCode`
configuration flag.

It sets the behavior of NullAway to always allow library models to override
the nullability of annotated code, with an important caveat regarding #445:

Whenever we have a method `D.m` which overrides a method `C.m` for which we
have a library model, NullAway's behavior depends on whether `D.m` is an
annotated or unannotated method:

1) If `D.m` is within unannotated / third-party code, we consider the library
   model of `C.m` to extend to `D.m` (and to all such third-party overriding
   methods of `C.m`). This minimizes redundancy in our library models and makes
   them more robust to the changes within third-party library internals.
2) However, for an overriding `D.m` within annotated code, we don't propagate
   the library model, requiring either `D.m` to be annotated in a compatible
   manner or else a separate library model for it.

This makes it so that libraries for which the user doesn't have the source code
(i.e. can't add annotations), but which they wish to add to the `AnnotatedPackages`
list, require more comprehensive library models than "unannotated" libraries.
However, this is fully consistent with the intent behind marking code as annotated,
which is stricter checking of its nullability.

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