Rust

make TextEdit::layouter accept the TextBuffer instead of &str #16

Job	Run time
ios	36s
Run tests	5m 54s
Check Windows	5m 33s
Format + check	6m 46s
Check wasm32 + wasm-bindgen	5m 46s
Check wasm32+atomics	2m 4s
android	1m 47s
cargo-deny aarch64-linux-android	38s
cargo-deny i686-pc-windows-msvc	39s
cargo-deny i686-pc-windows-gnu	42s
cargo-deny i686-unknown-linux-gnu	39s
cargo-deny aarch64-apple-darwin	44s
cargo-deny x86_64-apple-darwin	45s
cargo-deny x86_64-unknown-linux-gnu	40s
cargo-deny x86_64-pc-windows-msvc	41s
cargo-deny x86_64-pc-windows-gnu	39s
cargo-deny x86_64-unknown-redox	35s
cargo-deny wasm32-unknown-unknown	44s
cargo-deny x86_64-unknown-linux-musl	41s
	36m 33s

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