Progress on ls

[esther-ff]

The commit messages should describe stuff pretty accurately, but here are the changes:

• Refurbished the way how the long-format entries are printed
• Added a way to save the longest items to preserve the order found in GNU's ls -l
• Added basic sorting, with not yet finished version sorting
• Cleaned up some stuff

[puppymati]

Goes way over my head tbh. It's self contained to the ls command anyway.

@esther-ff can you confirm that this can be merged? If not mark it as a draft