Inconsistent handling of line endings on Windows vs Linux

[Plixo2]

Currently 35 tests on Windows fail.

Git converts all line endings of text to CRLF on Windows (default git behavior). Using the git config core.autocrlf=false will fix most of the tests. Adding a .gitattributes with * text eol=lf should work for everyone, although it would hide the underlying issue.

Many errors stem from some incorrect handling in the Lexer, e.g. here: https://github.com/effekt-lang/effekt/blob/a4c916fa3506db9899bc4387bdba14c8fee3578f/effekt/shared/src/main/scala/effekt/Lexer.scala#L627

Other errors come from string literal comparisons that fail, since the tests only expects '\n'.

As stated, there are a total of 35 tests that are failing and i am willing to share more insights and even fix them, when needed.