Fix CRLF Line Ending Typesetting

[thecoolwinter]

Description

Fixes a bug that made lines ending with the carriage return line feed (\r\n) string be typeset incorrectly, adding an extra visible line when one did not exist.

Also adds a few simple tests to avoid regression.

Related Issues

• N/A

Checklist

• I read and understood the contributing guide as well as the code of conduct
• The issues this PR addresses are related to each other
• My changes generate no new warnings
• My code builds and runs on my machine
• My changes are all related to the related issue above
• I documented my code

[FastestMolasses]

LGTM

[tom-ludwig]

@thecoolwinter even though this is already merged, why did you disable Swiftlint for testing?

[thecoolwinter]

I often disable it for test files because test files can become long or require long lines for test input. It wasn't necessary here in hindsight. I'll remove it in a future PR to keep things more clean.