Prepare for releasing v0.7.0. #1588

Job	Run time
cargo fmt	22s
cargo clippy + test (windows-latest)	2m 33s
cargo doc (windows-latest)	2m 42s
compare snapshots (windows-latest)	1m 37s
cargo clippy + test (macos-latest)	1m 12s
cargo doc (macos-latest)	2m 2s
compare snapshots (macos-latest)	39s
cargo clippy + test (ubuntu-latest)	2m 11s
cargo doc (ubuntu-latest)	2m 2s
compare snapshots (ubuntu-latest)	1m 18s
cargo clippy + test (wasm32) (windows-latest)	3m 41s
typos	4s
cargo clippy + test (wasm32) (macos-latest)	1m 31s
cargo clippy + test (wasm32) (ubuntu-latest)	1m 19s
	23m 13s

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