commander: move manual_control and switches out

This moves the remaining handling of the manual control stuff out
of commander. All communication between manual control now goes through
vehicle commands, and the landing gear topic.

src/modules/manual_control/ManualControl.cpp

@@ -215,6 +215,7 @@ void ManualControl::Run()
 					}
 
 					if (switches.gear_switch != _previous_switches.gear_switch) {
+
 						if (switches.gear_switch == manual_control_switches_s::SWITCH_POS_ON) {
 							publish_landing_gear(landing_gear_s::GEAR_UP);