Rustfmt

[jqnatividad]

Hi @probablykasper, I know you mentioned that you decided not to use rustfmt because of how it messed up formatting for lookup.rs and units.rs.

So I went ahead and used #[rustfmt::skip] for those modules and applied rustfmt.

Feel free to ignore this PR if you prefer not to use rustfmt at all.

[probablykasper]

Alright looked through the code. I think I'll just take care of it myself, and set the tab width to 2 spaces, then change from spaces to tabs in another commit

I'll skip lexer.rs as well because rustfmt almost doubles the line count there