Show airframe ID as vehicle name if vehicle name is not known

[gillamkid]

Description

If the vehicle airframe details aren't stored in QGC's AirframeFactMetaData.xml file, the Vehicle name is left blank. It would be more informative to show the airframe ID when the vehicle name isn't known.

ex.
Without the changes in this PR, If you use the PX4 SIH sim

~/PX4-Autopilot$ make px4_sitl sihsim_quadx

you see

with the changes in this PR, you will now see 10040 as the vehicle name. This is the airframe ID. A developer who knows about airframe IDs will know the meta data for the vehicle can be manually viewed in the airframe file, in this case PX4-Autopilot/ROMFS/px4fmu_common/init.d-posix/airframes/10040_sihsim_quadx

The vehicle name still shows the normal stuff if the vehicle has a known airframe id. For example, if you run

~/PX4-Autopilot$ make px4_sitl gz_x500

The changes in this PR do not change how it displays the recognized vehicle's metadata

[DonLakeFlyer]

To me it would be better to show airframe id in Airframe type. And then "Unknown" in Vehicle.

[gillamkid]

To me it would be better to show airframe id in Airframe type. And then "Unknown" in Vehicle.

I looked again at various vehicle definitions in PX4-Autopilot/ROMFS/px4fmu_common/init.d-posix/airframes

Vehicle name seems it is meant to be a unique identifier of a vehicle model the same way airframe id is meant to be a unique identifier of a vehicle model
ex. Aion Robotics R1 Rover, PX4 Vision Dev Kit v1.5

Vehicle type seems to be more of a categorization and refers to the general type of vehicle this vehicle model can be represented as
ex. Quadrotor, Plane, Balloon, Airship, Rover

I feel putting airframe ID as the vehicle name as I currently have it is most appropriate.

note: I gave a pretty bad example screenshot photo of the current behavior (picture with yellow marker on it) I would say many of the simulation airframes were given names that are too-generic. For example in my screen shot I connected to the airframe 4001_quad_x which has the vehicle name Generic Quadcopter. A better vehicle name would be Sample Gazebo Quadcopter Sim