Plane: version to 4.5.7 #785

Job	Run time
build (base)	8m 52s
build-gcc-heli	8m 47s
build (clang)	10m 56s
autotest-heli (sitltest-heli)	11m 8s
autotest (sitltest-copter-tests1a)	11m 44s
autotest (sitltest-copter-tests1b)	13m 34s
autotest (sitltest-copter-tests1c)	12m 5s
autotest (sitltest-copter-tests1d)	12m 2s
autotest (sitltest-copter-tests1e)	12m 57s
autotest (sitltest-copter-tests2a)	13m 42s
autotest (sitltest-copter-tests2b)	22m 25s
	2h 18m 12s

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