Basic flight telemetry

[djungelorm]

Add basic telemetry to Flight class. This functionality depends on reference frames, so is blocked by #17

See https://github.com/krpc/krpc/blob/main/service/SpaceCenter/src/Services/Flight.cs

• Vessel.Flight(referenceFrame) to construct instances
• Vessel.Velocity
• Vessel.Speed
• Vessel.HorizontalSpeed
• Vessel.VerticalSpeed
• Veseel.CenterOfMass
• Veseel.Rotation
• Veseel.Direction
• Veseel.Pitch
• Veseel.Heading
• Veseel.Roll
• Vessel.Prograde
• Vessel.Retrograde
• Vessel.Normal
• Vessel.AntiNormal
• Vessel.Radial
• Vessel.AntiRadial