Add viewer for 3D models and scenes

[ES-Alexander]

Useful for things like

• showing the current vehicle attitude
  • this could use the vehicle's active model when using BlueOS, and could likely make use of @Williangalvani's model viewing code from the BlueOS Vehicle Setup page
  • SpaceX have recently added this kind of functionality to their streams:
• showing the vehicle/mission within its 3D environment
  • this is particularly useful if there's no camera feed, but there is a positioning system and a map with buildings and/or terrain data
  • this was recently demoed in QGC, using OpenStreetMap data
  • should support custom 3D area models as the source
  • should support projection mapping from an overhead / satellite image
    • even better if it also supports overlay / live projection/photogrammetry from a camera feed on the vehicle
  • could (ideally) support live updates from a source of surface distance data compared to the vehicle's barometric altitude/depth
    • for water-based use-cases this would need to take tide level (and waves?) into account

If done using .glb files this could likely integrate quite nicely with AR/VR viewers/headsets.

[Ryanf55]

Here's some ideas:

• A 3D UI capable of showing the UAV live
• Pose updates smoothly
• Vehicle type sets the vehicel in the simulation (plane, copter, sub)
• Shows all geofence data
• Has a HUD (and tied to the map)
• Views for 3rd person birds eye (follow), FPV front view, and the flight simulator 3rd person trailing, and completely free view
• Easy to extend for custom non-mavlink messages (say a custom ROS path planner wants to visualize a special flight plan
• Works well with ArduPilot, but can be used with other non-mavlink autopilots
• For this, I am wondering if it makes sense to expose a non-mavlink message API
• Ability to set GoTo waypoints
• Ability to add custom user controls (IE, plan path from A to B using a ROS path planner)

Our companion computer has no way to visualize any data unless we use RVIZ. I want a tool that I can extend to visualize proprietary 3D data that has a solid foundational base capability that it's useful on its own.

Laastly, I need ability to visualize custom data from custom algorithms from the companion computer. This would likely require direct access to the cesium viewer object. Because the data may be proprietary, I would like to be sure the licensing of the code does not mean plugin developers modifying cockpit will have to release those modifications to their customers.