Remote control takeover

[juangallostra]

Feature / Bug description

When executing a flight mission, if new TX input is received it should have a higher priority than the planner.

Expected behavior

Moving the TX sticks while executing a flight mission results in the Mosquito behaving as the sticks indicate and disregarding the flight mission commands.

[juangallostra]

The implemented behavior is that when the value of aux1 is changed (it doesn't matter if from low to high or from high to low) the execution of the mission is stopped and the TX takes the control of the drone.