* Allow use of AutoConnect and HighLatency options for most link types.

* Remove isAutoConnectAllowed and isHighLatencyAllowed methods and assocated Q_PROPERTYs from LinkConfiguration class.  Allow user to configure these properties on all link types.

New VehicleLinkManager implementation

Clean up references to MainRootWindow globals

Full BATTERY_STATUS support

Switch to Controls 2 version of QGCButton

VTOL Takeof/Landing Pattern work

Reorg of settings order

Remove AutoLoad support

Cherry pick virtual joystick fix from Stable

Added a transmitOnly flag to UDP config. When enabled, the socket receive buffer is set to zero such that no data is ever received. Also updated the MavlinkSettings page such that new config settings respect the setting visibility.

Updated mavlink forwarding implementation to forward all mavlink messages received on all channels onto a single UDP port. A new mavlink forwarding UDP link is created if forwarding is enabled. The mavlink settings page now has a Fact checkbox for enabling forwarding and a fact text field for specifying the host name.

Added mavlink forwarding as an option to UDP connections. Enabling this setting will cause every mavlink packet received by QGC to be forwarded on the link, with the exception of packets originating from said link.

Add note about ADSB server settings

Temporary use setting for using CONDITION_GATE in Patterns

Plan: Add support for takeoff item required

Allow telemetry settings section to hide

minimalRemainingMissionTime added to General Settings, and Low Battery Handling on small minimalRemainingMissionTime function added

Tweak chart colors

Support Keep map centered on vehicle

ADSB server support provided through new ADSBVehicleManager implemenation

Fix textRole usage for QGCComboBox

No need for all the null checks with correct qml shutdown