run fix clippy warnings in the repository

[budziq]

The codebase could use some minor cleanups:
We should run clippy on the codebase and fix its warnings.

It is a nice introductory task to get someones feet wet in the project with some light mentoring.

[jacwah]

Is this resolved by #466?

[azerupi]

Was that all the clippy warnings?
I am surprised we got so few warnings on the whole code base 😲

[jacwah]

#466 fixes all but the two warnings I listed. I'm not sure what to do about those, so would love some feedback :)

[azerupi]

I'm not sure what to do about those, so would love some feedback

I would mark them as allowed (or ignore? whatever clippy understands) on a case by case basis. We should avoid disabling the warning on the whole code base and evaluate every instance as they come.