MAINT: Use `.identifier = val` intializer for all type related structs

This changes it for most occurances (not quite all), some small
slots, e.g. the buffer interface, are not changed unless close
to another defintion. There are no large chuncks of "filler"
zeros left though (except in rationaltests.c.src).

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This was not used previously due to it requiring C99. Python
itself acknowledges that it can be used (they do almost not use it
as of now), except inside header files due to C++ compatibility.

See also (Found by Eric Wieser in PR):
https://mail.python.org/pipermail/python-dev/2017-January/147154.html
and PEP 7: https://www.python.org/dev/peps/pep-0007/#c-dialect

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