Derive `PartialEq` for `Stroke`, common derives for `StrokeOpts`. #621

Job	Run time
cargo clippy (wasm32)	39s
cargo check (msrv) (windows-latest)	53s
cargo check (msrv) (wasm32)	22s
cargo check (msrv) (macos-latest)	32s
cargo clippy (windows-latest)	1m 13s
cargo check (msrv) (ubuntu-latest)	27s
cargo doc	19s
cargo clippy (macos-latest)	59s
cargo fmt	23s
cargo clippy (ubuntu-latest)	41s
cargo test (windows-latest)	1m 7s
cargo test (wasm32)	22s
cargo test (macos-latest)	41s
typos	5s
cargo test (ubuntu-latest)	21s
	9m 4s

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