lms

Implement SST scheme #324

Job	Run time
msrv	4m 3s
clippy	30s
check-for-todos	7s
rustfmt	7s
set-msrv	4s
bench	40s
demo-lms (stable, default)	19s
build (1.63, thumbv7em-none-eabi)	2m 2s
cross (1.63, aarch64-unknown-linux-gnu, default)	8m 35s
build (1.63, wasm32-unknown-unknown)	1m 54s
cross (stable, aarch64-unknown-linux-gnu, default)	6m 37s
demo-sst (stable, default)	24s
build (stable, thumbv7em-none-eabi)	17s
test (1.63)	4m 2s
build (stable, wasm32-unknown-unknown)	12s
test (stable)	2m 7s
	32m 0s

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