Make builds fail on clippy warnings

[EverlastingBugstopper]

We removed this earlier because we were impatient with it, but it has resulted in a LOT of clippy warnings being introduced into our codebase.

This will require some clippy ignores (looking at you #824) and that we address the warnings that have been introduced.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[EverlastingBugstopper]

we actually did this one!