lms

Implement SST scheme #329

Job	Run time
clippy	21s
msrv	3m 31s
rustfmt	7s
check-for-todos	6s
set-msrv	5s
bench	40s
demo-lms (stable, default)	26s
cross (1.63, aarch64-unknown-linux-gnu, default)	7m 56s
build (1.63, thumbv7em-none-eabi)	1m 11s
cross (stable, aarch64-unknown-linux-gnu, default)	6m 46s
build (1.63, wasm32-unknown-unknown)	1m 12s
demo-sst (stable, default)	30s
build (stable, thumbv7em-none-eabi)	13s
build (stable, wasm32-unknown-unknown)	13s
test (1.63)	1m 26s
test (stable)	1m 7s
	25m 50s

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