pylint pass

[jakkdl]

Looks like there's bugs in both mypy and pylint with regards to the __eq__ in Statement in flake8_trio.py (nobody mentions NamedTuple in python/mypy#6910 - but I think it's the same?), and while the pylint issue pylint-dev/pylint#225 is closed it's cropping up in checkpoint_continue/break as well.
But with 11 disabled flags flake8_trio and tests/test* now pass without any errors - though if pylint was added to tox a few of those would probably be #pylint: disable=XXX instead.

I elected to explicitly set encoding in all opens as well, according to https://peps.python.org/pep-0597/

I also wiped a redundant test after running pylint --disable=all --enable=similarities tests/trio* - but that also gives a bunch of false positives. Though I am tempted to merge 103&104, and instead of doing #error: to mark errors do #TRIO\d\d\d:. I think this would also allow more #INCLUDE (or rather, change it to #EXCLUDE and only use that when necessary) and that might catch more stuff that's missing an explicit check.

[Zac-HD]

This all looks reasonable to me, but let's not bother with further changes; it doesn't add much value and we're nearly done anyway.

[jakkdl]

makes sense, I'll just run pylint locally then to catch any bugs while developing 👍