Implement M66 Immediate mode #745

Job	Run time
tests (ubuntu-latest, tests)	2m 39s
build (ubuntu-latest, noradio)	1m 48s
tests (macos-latest, tests)	26s
build (ubuntu-latest, wifi)	2m 6s
tests (windows-latest, tests_nosan)	1m 20s
build (ubuntu-latest, bt)	2m 0s
build (macos-latest, noradio)	2m 11s
build (macos-latest, wifi)	1m 39s
build (macos-latest, bt)	1m 37s
build (windows-latest, noradio)	4m 34s
build (windows-latest, wifi)	4m 34s
build (windows-latest, bt)	4m 44s
	29m 38s

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