[issue37760] Refactor makeunicodedata.py: dedupe parsing, use dataclass

[Serhiy Storchaka]

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

> I just checked and `python3.6 Tools/unicode/makeunicodedata.py` works fine, both at master and with GH-15248.

This is good. But the title mentioned dataclasses, and they are 3.7+.

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