Rust

Classify viewports using `enum ViewportClass` #178

Job	Run time
android	28s
Check wasm32 + wasm-bindgen	2m 42s
Format + check + test	2m 47s
cargo-deny aarch64-apple-darwin	42s
cargo-deny aarch64-linux-android	43s
Check Windows	2m 15s
cargo-deny i686-pc-windows-gnu	40s
cargo-deny i686-pc-windows-msvc	41s
cargo-deny i686-unknown-linux-gnu	40s
cargo-deny wasm32-unknown-unknown	40s
cargo-deny x86_64-apple-darwin	43s
cargo-deny x86_64-pc-windows-gnu	43s
cargo-deny x86_64-pc-windows-msvc	43s
cargo-deny x86_64-unknown-linux-gnu	42s
cargo-deny x86_64-unknown-linux-musl	39s
cargo-deny x86_64-unknown-redox	1m 11s
	16m 59s

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