git: Enforce LF lineendings for everything #3484
Someone on discord reported issues with UI tests. This should make sure that git never automatically converts lineendings for text files to `CRLF`. They should always be `LF` now. Probably this means that we can stop using dos2unix for #3306, too. Taken from [Rust's .gitattributes file](https://github.com/rust-lang/rust/blob/master/.gitattributes).
Add this suggestion to a batch that can be applied as a single commit. This suggestion is invalid because no changes were made to the code. Suggestions cannot be applied while the pull request is closed. Suggestions cannot be applied while viewing a subset of changes. Only one suggestion per line can be applied in a batch. Add this suggestion to a batch that can be applied as a single commit. Applying suggestions on deleted lines is not supported. You must change the existing code in this line in order to create a valid suggestion. Outdated suggestions cannot be applied. This suggestion has been applied or marked resolved. Suggestions cannot be applied from pending reviews. Suggestions cannot be applied on multi-line comments.