Tools: add AutoLand fixed-wing mode #1450

Job	Run time
build (base)	6m 48s
build-gcc-heli	2m 17s
build (clang)	2m 7s
autotest-heli (sitltest-heli)	10m 28s
autotest (sitltest-copter-tests1a)	7m 33s
autotest (sitltest-copter-tests1b)	9m 14s
autotest (sitltest-copter-tests1c)	11m 16s
autotest (sitltest-copter-tests1d)	9m 9s
autotest (sitltest-copter-tests1e)	8m 57s
autotest (sitltest-copter-tests2a)	10m 21s
autotest (sitltest-copter-tests2b)	29m 43s
	1h 47m 53s

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