Derive PartialEq by hand to avoid ColorSpace: PartialEq bound #302

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Job	Run time
cargo clippy (wasm32)	22s
cargo clippy (windows-latest)	54s
cargo clippy (macos-latest)	26s
cargo clippy (ubuntu-latest)	24s
cargo check (msrv) (wasm32)	17s
cargo check (msrv) (windows-latest)	59s
cargo doc	16s
formatting	29s
cargo check (msrv) (macos-latest)	22s
cargo check (msrv) (ubuntu-latest)	16s
cargo test (windows-latest)	43s
cargo test (wasm32)	18s
cargo test (macos-latest)	21s
typos	8s
cargo test (ubuntu-latest)	19s
	6m 34s

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