Convert line endings from CRLF to LF.

[johnjohndoe]

• Please make sure to configure your Git config to automatically convert line endings for your operating system. The repository should however only contain files with Unix line endings LF. Otherwise a full file diff will constantly appear in the working directory which makes a particular hard for contributors to checkout, update and rebase branches.
• This commit introduces no code changes.
• For your reference: https://git-scm.com/book/en/v2/Customizing-Git-Git-Configuration#Formatting-and-Whitespace