AP_Scripting: promote video-stream-information to applet #3621

Job	Run time
build (base)	2m 32s
build (clang)	2m 3s
autotest (sitltest-rover)	17m 58s
autotest (sitltest-sailboat)	2m 59s
autotest (sitltest-balancebot)	7m 56s
	33m 28s

Provide feedback