Consolidated stepping engine code #774

Job	Run time
tests (ubuntu-latest, tests)	40s
build (ubuntu-latest, noradio)	1m 51s
tests (macos-latest, tests)	28s
build (ubuntu-latest, wifi)	2m 18s
tests (windows-latest, tests_nosan)	1m 25s
build (ubuntu-latest, bt)	2m 11s
build (macos-latest, noradio)	1m 38s
build (macos-latest, wifi)	1m 48s
build (macos-latest, bt)	1m 40s
build (windows-latest, noradio)	4m 10s
build (windows-latest, wifi)	6m 21s
build (windows-latest, bt)	6m 16s
	30m 46s

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