lms

Implement SST scheme #312

Job	Run time
msrv	3m 53s
check-for-todos	3s
rustfmt	13s
clippy	26s
set-msrv	8s
bench	45s
demos (stable, default)	5s
cross (1.63, aarch64-unknown-linux-gnu, default)	8m 39s
build (1.63, thumbv7em-none-eabi)	3m 36s
cross (stable, aarch64-unknown-linux-gnu, default)	6m 40s
build (1.63, wasm32-unknown-unknown)	2m 8s
test (1.63)	3m 58s
build (stable, thumbv7em-none-eabi)	16s
test (stable)	2m 4s
build (stable, wasm32-unknown-unknown)	19s
	33m 13s

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