Modernize repo and make sure it works with ST4

[Frizlab]

That being said:

• I have no idea if it works before ST4 now;
• I have not succeeded in running the tests (UnitTesting shows a panel at the bottom, but it is desperately empty; I suspect a syntax error, or something of that nature, but I don’t know for sure and am not sure how to debug…);
• I have removed the support for vim modelines. There is a dedicated plugin for that if needed; let’s not mix everything up!
• I migrated the EoL from dos to unix;
• I removed things that I thought were useless; I hope they actually were!

[michaelblyons]

I'm still loosely watching your progress. (Great work, btw!)

If you hadn't noticed, some time in the last two days, the CI started failing without test output.

[Frizlab]

Thanks!

Yes, I know, I intend to fix that before marking the PR ready.

I'm missing the parser for the VIM and classic modelines, as well as fixing and adding some tests and then I'll be good!