Allow rewinding of commands sent via UART buffer #766

Job	Run time
tests (ubuntu-latest, tests)	29s
build (ubuntu-latest, noradio)	1m 50s
tests (macos-latest, tests)	38s
build (ubuntu-latest, wifi)	2m 12s
tests (windows-latest, tests_nosan)	1m 20s
build (ubuntu-latest, bt)	2m 6s
build (macos-latest, noradio)	1m 46s
build (macos-latest, wifi)	2m 35s
build (macos-latest, bt)	1m 55s
build (windows-latest, noradio)	4m 0s
build (windows-latest, wifi)	4m 41s
build (windows-latest, bt)	4m 40s
	28m 12s

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