Remove `Mix::Clip` #535

Job	Run time
cargo test (macos-latest)	30s
cargo clippy (wasm32)	24s
cargo test (ubuntu-latest)	21s
formatting	1m 43s
cargo test (wasm32)	21s
cargo test (windows-latest)	1m 10s
cargo check (msrv) (macos-latest)	22s
cargo check (msrv) (windows-latest)	1m 6s
cargo check (msrv) (ubuntu-latest)	22s
cargo clippy (ubuntu-latest)	24s
cargo clippy (windows-latest)	1m 2s
cargo clippy (macos-latest)	31s
cargo doc	20s
typos	4s
cargo check (msrv) (wasm32)	21s
	9m 1s

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