lms

Implement SST scheme #320

Job	Run time
check-for-todos	5s
clippy	13s
msrv	4m 15s
rustfmt	6s
set-msrv	3s
build (1.63, thumbv7em-none-eabi)	2m 3s
bench	43s
build (1.63, wasm32-unknown-unknown)	2m 2s
demo-lms (stable, default)	26s
cross (1.63, aarch64-unknown-linux-gnu, default)	8m 30s
build (stable, thumbv7em-none-eabi)	22s
demo-sst (stable, default)	21s
cross (stable, aarch64-unknown-linux-gnu, default)	6m 30s
build (stable, wasm32-unknown-unknown)	15s
test (1.63)	3m 54s
test (stable)	2m 15s
	32m 3s

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