Add control of line height and letter spacing #6956

Job	Run time
android	43s
Check wasm32 + wasm-bindgen	1s
Format + check + test	4m 48s
Check Windows	1m 48s
cargo-deny aarch64-apple-darwin	1s
cargo-deny aarch64-linux-android	1s
cargo-deny i686-pc-windows-gnu	4m 31s
cargo-deny i686-pc-windows-msvc	4m 10s
cargo-deny i686-unknown-linux-gnu	2s
cargo-deny wasm32-unknown-unknown	4m 21s
cargo-deny x86_64-apple-darwin	3m 52s
cargo-deny x86_64-pc-windows-gnu	1s
cargo-deny x86_64-pc-windows-msvc	2s
cargo-deny x86_64-unknown-linux-gnu	4m 7s
cargo-deny x86_64-unknown-linux-musl	4m 2s
cargo-deny x86_64-unknown-redox	3m 58s
	36m 28s

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