Core: Add Mavlink takeoff cmd
Core: Create function to make the drone takeoff
Android: Add takeoff action button back to flight screen
Android: Add arm button to main screen
Android: Add connection button to FlightActionsFragment
Android: Setup buttons on flightControl fragment accordinly to flight state
Android: Change connect action icon to a little antenna
Android: Add "Auto" button for flight control fragment
Android: Add behavior to the "auto" action button
Android: Add new icons from @jason4short
Merge pull request #1090 from arthurbenemann/flightState

Flight state buttons