Implement M66 Immediate mode #722

Job	Run time
tests (ubuntu-latest, tests)	34s
build (ubuntu-latest, noradio)	1m 59s
tests (macos-latest, tests)	30s
build (ubuntu-latest, wifi)	2m 16s
build (ubuntu-latest, bt)	1m 56s
tests (windows-latest, tests_nosan)	1m 11s
build (macos-latest, noradio)	1m 35s
build (macos-latest, wifi)	1m 41s
build (macos-latest, bt)	1m 40s
build (windows-latest, noradio)	4m 32s
build (windows-latest, wifi)	4m 59s
build (windows-latest, bt)	4m 48s
	27m 41s

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