Rename `utils.rs` to `afs.rs`?

[evanlinjin]

Can we rename this module to afs.rs?

Originally posted by @evanlinjin in #65 (comment)

[nymius]

#72 is also introducing fisher_yates_shuffle. Shouldn't that be moved to utils.rs and utils.rs be renamed to something like no_std_rand or similar?

[evanlinjin]

@nymius I feel like fisher_yates_shuffle is a small method and only called used in one place though.

I guess we can make the same argument for AFS - maybe it should just belong in selection.rs.

[nymius]

Even if you keep the code close to the components that are using it, you're duplicating some code by creating the fisher-yates shuffle on first instance.

[evanlinjin]

@nymius I missed that! no_std_rand.rs sounds good.

[evanlinjin]

@nymius I did it in #72.