Restored range limiting to the throttle channel. Now if the UAS can't reverse, the throttle can be set to only use the positive range of the axis (useful with auto-centering control sticks) or to use the full range (for sticks that hold position).
The settings for each joystick are loaded and saved on switch. The state of the enable joysticks checkbox is not saved yet, however, though it should really be tracked by JoystickInput so that it can sleep more when joysticks are disabled.