Add minor optimisations and general clippy cleanup #220

Job	Run time
Extract crate metadata	5s
Ensure 'cargo fmt' has been run	11s
Minimum supported rust version	48s
aarch64-unknown-linux-gnu (ubuntu-20.04)	2m 23s
arm-unknown-linux-gnueabihf (ubuntu-20.04)	2m 13s
arm-unknown-linux-musleabihf (ubuntu-20.04)	2m 23s
i686-pc-windows-msvc (windows-2019)	4m 20s
i686-unknown-linux-gnu (ubuntu-20.04)	1m 38s
i686-unknown-linux-musl (ubuntu-20.04)	1m 44s
x86_64-apple-darwin (macos-12)	2m 17s
x86_64-pc-windows-gnu (windows-2019)	3m 28s
x86_64-pc-windows-msvc (windows-2019)	3m 44s
x86_64-unknown-linux-gnu (ubuntu-20.04)	1m 53s
x86_64-unknown-linux-musl (ubuntu-20.04)	1m 38s
Publish to Winget	0s
	28m 45s

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