AP_Scripting: script to disable subset of motors in fwd flight #41227

Job	Run time
build (base)	6m 32s
build (clang)	8m 53s
autotest (sitltest-plane-tests1a)	14m 18s
autotest (sitltest-plane-tests1b)	21m 53s
autotest (sitltest-quadplane)	14m 45s
	1h 6m 21s

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