Implement M66 Immediate mode #720

Job	Run time
tests (ubuntu-latest, tests)	28s
build (ubuntu-latest, noradio)	1m 48s
tests (macos-latest, tests)	28s
build (ubuntu-latest, wifi)	2m 18s
tests (windows-latest, tests_nosan)	1m 28s
build (ubuntu-latest, bt)	1m 56s
build (macos-latest, noradio)	1m 28s
build (macos-latest, wifi)	1m 40s
build (macos-latest, bt)	2m 30s
build (windows-latest, noradio)	4m 11s
build (windows-latest, wifi)	5m 49s
build (windows-latest, bt)	4m 42s
	28m 46s

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