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

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

Configurable Go To Location max distance

- NorthUp becomes NoseUp and is disable by default
- Changes on SVG to make them with the same diameter as the CompassDiag
- Change the order of the indicator layouts

- Remove HomeHeading / COG / HeadingToNext
- Add setting AdditionalIndicatorsCompass that group the previous
  settings

- Add setting for Heading to Next WP and Nort Up lock
- Add check for vehicle for every indicator to avoid showig them while
  no vehicle

Fix Mocklink UI

- Reimplement same behaviour as version 3.1 while resizing the window :
    Stretch the text area to fit the screen
- Change setting text from Alternate Instrument Panel to Vertical Instrument Panel

By default the Instrument Panel is the one from master,
It can be switched to alternate version by a checkbox in General Settings/Fly View