Bug fixes:
* Prevent `ChainMap`, `Counter` and `OrderedDict` from being dropped if they're
only imported.
* Fix matching against a plain fiddle.Config in pyi signatures.
* Remove no-longer-necessary `__getattribute__`s from enum.pytd.
* Resolve attribute access on Any constants in pytd to just the constant.
* Don't let `typing` be treated as a replaceable Any.
* FIX: Only call match_fiddle_instance_against_bare_type if we have a fiddle
instance.