Initial implementation of a StaticShape type #496

Job	Run time
cargo fmt	11s
cargo clippy+test (macOS-latest)	41s
cargo test msrv	1m 5s
cargo clippy+test (windows-2019)	3m 15s
Docs (macOS-latest)	18s
cargo clippy+test (ubuntu-latest)	38s
cargo test nightly (macOS-latest)	25s
Docs (windows-2019)	1m 53s
cargo test nightly (windows-2019)	57s
Docs (ubuntu-latest)	31s
cargo clippy+test (wasm32) (macOS-latest)	32s
cargo test nightly (ubuntu-latest)	25s
cargo clippy+test (wasm32) (windows-2019)	2m 49s
cargo clippy+test (wasm32) (ubuntu-latest)	34s
	14m 14s

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