Refactored logging.ColoredFormatter to avoid deepcopy.

[Julian-O]

This is a clean up of kivy.logger code, as described in #7959 It has no effect to the way log files appear or how they are used. It is an internal refactor.

It has an incidental effect of no longer using deepcopy() on logRecords, so it fixes #7528 and #7585.

Maintainer merge checklist

• Title is descriptive/clear for inclusion in release notes.
• Applied a Component: xxx label.
• Applied the api-deprecation or api-break label.
• Applied the release-highlight label to be highlighted in release notes.
• Added to the milestone version it was merged into.
• Unittests are included in PR.
• Properly documented, including versionadded, versionchanged as needed.

[misl6]

Hi @Julian-O !
LGTM. Thank you!

I've just some minor things that may be addressed before the merge:

• copy is still imported even if it's not used anymore
• randint is still imported even if it's not used anymore (not your fault)

Also (and could be fixed later), I've seen that there's still a try/except for Python 2 compat, feel free to remove it, as we don't support Python 2 anymore.

[Julian-O]

I agree with everything you said - and I have already fixed them all, and more, in the next PR I have planned.

Can we please merge this one now if I promise to give you a PR with those changes in the next couple of days? I am trying to balance giving you small, incremental improvements that are self-contained and easy-to-review versus how long it will take to get through the backlog (on the order of 7 more PRs?) with review delays between each one. (Happy to hear advice on this.)

[misl6]

I am trying to balance giving you small, incremental improvements that are self-contained and easy-to-review
I like it 💯

Yeah, the only one which is really related is copy, but if you promise to remove it in a while (and you promised it 😄 ), there's no issue to get it merged now.

Thank you again!