Initial implementation of a StaticShape type #479

Job	Run time
cargo fmt	14s
cargo test nightly (macOS-latest)	42s
cargo test msrv	1m 14s
cargo test nightly (windows-2019)	48s
Docs (macOS-latest)	1m 22s
cargo clippy+test (macOS-latest)	1m 1s
Docs (windows-2019)	50s
cargo test nightly (ubuntu-latest)	25s
cargo clippy+test (windows-2019)	1m 35s
cargo clippy+test (wasm32) (macOS-latest)	1m 1s
Docs (ubuntu-latest)	22s
cargo clippy+test (ubuntu-latest)	44s
cargo clippy+test (wasm32) (windows-2019)	1m 21s
cargo clippy+test (wasm32) (ubuntu-latest)	35s
	12m 14s

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