[issue1820] Enhance Object/structseq.c to match namedtuple and tuple api

[Stefan Krah]

Stefan Krah added the comment:

>> 1. _asdict() returns a normal dictionary. I don't know if this is what
>>    is required.

Good question. I don't think we can import OrderedDict from collections
because of the impact on startup time (_collections_abc was created to
avoid the issue for MutableMapping).

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