Fix code style (phpcs. phpstan, styleint, cspell, eslint, ...)

I'd like to work on this, I'll take it, if you don't mind.

Also see 📌 Fix the issues reported by phpcs RTBC - maybe that's a good starting point

Thanks @danrod - go for it :)
And please use a MR.

@danrod I did some preparation work, please use the prepared MR for further fixes.

Thanks @anybody, I'll use the MR 90 instead, I was confused on which one should work on, this one or the issue #3036556: Fix the issues reported by phpcs

@danrod: That's indeed confusing a bit, sorry.

I'd say:

1. I'll merge the phpcbf fixes here, none of them are risky
2. I'll update 📌 Fix the issues reported by phpcs RTBC with the fixes
3. For PHPCS continue in 📌 Fix the issues reported by phpcs RTBC - as the issue already has a lot of feedback
4. For the other fixes continue here

Thanks @anybody , I'll look on that now that I have some time (off work).

I fixed a bunch of PHPCS, CSPELL and STYLELINT issues today, I shall continue with the work tomorrow. A lot of work to do here.

Good night !

Thank you @danrod! Great!
Please note the comments over at 📌 Fix the issues reported by phpcs RTBC

Yep, indeed this seems more complicated than expected, a lot of testing is needed.