lms

Implement SST scheme #319

Job	Run time
clippy	18s
check-for-todos	8s
rustfmt	7s
msrv	3m 51s
set-msrv	3s
cross (1.63, aarch64-unknown-linux-gnu, default)	8m 20s
cross (stable, aarch64-unknown-linux-gnu, default)	6m 26s
bench	46s
test (1.63)	3m 50s
test (stable)	2m 11s
build (1.63, thumbv7em-none-eabi)	1m 48s
demo-lms (stable, default)	22s
build (1.63, wasm32-unknown-unknown)	1m 54s
demo-sst (stable, default)	24s
build (stable, thumbv7em-none-eabi)	15s
build (stable, wasm32-unknown-unknown)	18s
	31m 1s

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