Mission: Switch back to item #, plus alt display

Bluetooth Cleanup

Removing old comm link settings.

Mobile runs Native QML

Continuous drag of mission items

After last delete don't move to invalid home position

Remove all message and file dialog code from mobile

Message box

* MavLink/master:
  Remove QGCMessageBox usage
  Change window close sequence to prompt user from Qml side
  Fix live values
  Clear unsent channels
  Live flight mode config

Conflicts:
	src/ui/MainWindow.h

More message box removal

Live RC values in APM Flight Mode config

Convert QGCMessageBox to QGCApplication::showMessage

Apm flight mode config

APM Stack Radio Config

Refactored PX4 radio config to work with both PX4 and APM