Remove `Mix::Clip` #533

Job	Run time
formatting	2m 4s
cargo clippy (macos-latest)	21s
cargo clippy (wasm32)	17s
cargo clippy (ubuntu-latest)	19s
cargo clippy (windows-latest)	32s
cargo test (windows-latest)	37s
cargo test (ubuntu-latest)	22s
cargo test (macos-latest)	28s
cargo test (wasm32)	21s
typos	4s
cargo check (msrv) (ubuntu-latest)	22s
cargo check (msrv) (macos-latest)	21s
cargo check (msrv) (windows-latest)	48s
cargo check (msrv) (wasm32)	17s
cargo doc	14s
	7m 27s

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