Fix Clippy errors and enable Clippy checks in CI #187

Job	Run time
clippy	16s
Test (ubuntu-latest, 1.70)	30s
docs	11s
Test (ubuntu-latest, stable)	23s
Rustfmt	6s
Test (ubuntu-latest, beta)	29s
Test (ubuntu-latest, nightly)	37s
Test (macos-latest, 1.70)	25s
Test (macos-latest, stable)	20s
Test (macos-latest, beta)	25s
Test (macos-latest, nightly)	24s
Test (windows-latest, 1.70)	1m 2s
Test (windows-latest, stable)	1m 27s
Test (windows-latest, beta)	1m 20s
Test (windows-latest, nightly)	1m 13s
Test Cross Compile - aarch64-apple-ios	24s
Test Cross Compile - aarch64-unknown-linux-gnu	55s
Test Cross Compile - arm-unknown-linux-gnueabihf	39s
Test Cross Compile - powerpc-unknown-linux-gnu	39s
Test Cross Compile - s390x-unknown-linux-gnu	40s
Test Cross Compile - x86_64-unknown-linux-musl	43s
Test Cross Compile - aarch64-unknown-linux-musl	31s
Test Cross Compile - x86_64-pc-solaris	15s
Test Cross Compile - x86_64-pc-windows-gnu	52s
Test Cross Compile - x86_64-unknown-netbsd	38s
Test Cross Compile - x86_64-unknown-illumos	40s
	16m 4s

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