chore: Clean up some `use` blocks and qualifications. #18

Job	Run time
cargo check (msrv) (wasm32)	16s
cargo check (msrv) (windows-latest)	35s
cargo clippy (windows-latest)	37s
cargo check (msrv) (macos-latest)	22s
cargo clippy (wasm32)	15s
cargo clippy (macos-latest)	23s
cargo check (msrv) (ubuntu-latest)	14s
cargo clippy (ubuntu-latest)	23s
cargo doc	11s
formatting	23s
cargo test (windows-latest)	32s
cargo test (wasm32)	22s
typos	5s
cargo test (macos-latest)	19s
cargo test (ubuntu-latest)	16s
	5m 13s

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