[issue35333] Rename private structs to use names closer to types

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

I don't know reasons against using the same name for the structure and the type. This can break extensions written before exposing the current Python C API in Python 1.5, but they should be already broken several times.

This is a cosmetic but large change. I suggest to ask on Python-Dev for the case if somebody has objections or better idea.

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<https://bugs.python.org/issue35333>
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