Revert ParameterEditor to QtQuick.Controls 1.x

QtQuick.Controls 2.4

Update all files that use a QML Menu item to QtQuick.Controls 2.4 to solve the issue of a menu showing up in random places on Android.

Custom Build Example

Move fly view away from background and into main window. The size different was causing the map not to match the one in plan view.

Move PreflightCheckList to custom builds only. The model, which used to be implemented within BuiltinPreFlightCheckModel is now within the control itself. It is up to the implementer to define a proper model.

Adding VTOL Octoplane airframe type

Stable merge

Update OSX SDL2.Framework to 2.09

Mavlink protocol version negotiation fixes

Update SDL2.Framework to 2.09

Fix combo box height

Remove old code and fix typo

ArduCopter Heli: Support 8 servos

Replace usage of QMessageBox with a QML window.