FGData Merge Request #288: Control: Add ufo autopilot requested by Stuart (merged)

As requested by stuart in generic autopilot rework merge request.
UFO behaves predictably, so absolute calculations work well here.

Kind Regards,
Josh

[Josh Davidson]

Removed compared to generic:

• FPA mode - useless because no alpha in ufo, just use pitch
• Speed by pitch - doesn't work with ufo because no lift/drag
• Mach by throttle - doesn't work because ufo doesn't calculate mach

[Stuart Buchanan]

Hi Josh,

That's top quality work. Thank-you!

-Stuart

[Josh Davidson]

My pleasure. Thanks Stuart.
Josh