[issue30095] HTMLCalendar allow custom classes

[Oz Tiram]

Oz Tiram added the comment:

@Walter, 

I implemented two possible solutions. Chronologically speaking V2 was implemented before V1, but it's a bit über-smart and might surprise it's
users requiring the class attributes to be some kind of iterable.

The first version is my current preferred solution.

I intentionally didn't create a PR for that yet. 

These are the branches:

https://github.com/oz123/cpython/tree/issue30095-v1
https://github.com/oz123/cpython/tree/issue30095-v2

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