F/A-18 Added to the demo

I wanted to let you guys know that I've added the F/A-18 to the demo. I was inspired by the new Top Gun movie coming out and learning about the Nimitz encounters so felt I needed to get the plane in :) I feel like the plane flies a bit sluggish compared to how it should, so hopefully some of the simulation data can be tweaked in time.

Also added are some new aircraft buttons, you can toggle the afterburner now (important!), as well as a button to cut the engines and to toggle the braking. So it should theoretically be possible to properly land and park now if that's something you'd like to practice.