Telemetry Values bar at center bottom

ToolStrip rearchitecture for encapsulation and customization

Rework Fly View into separate layers which can be customized at each layer.

More work on encapsulation in Fly View

Fly View: Move business logic inside controls

Mavlink terrain protocol support

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.