j4rs
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Resolve more clippy lints
This PR is a continuation of https://github.com/astonbitecode/j4rs/pull/117
Now that all the automatically --fixable lints are resolved, in this PR I manually fixed a bunch of lints.
I've left a few lints unfixed that seemed possibly controversial, everything in this PR should be clear improvements.
For reasoning behind the ToString -> Display changes see: https://rust-lang.github.io/rust-clippy/master/index.html#to_string_trait_impl