Keep ball tracking raw in cv.json

The ball trajectories in cv.json are fitted points on a parabola. I’d prefer just the raw frames with a confidence scale. This will allow me to fit whatever curve I want. Maybe I want to model bends and corkscrews. A parabola only exists in a vacuum.

Right now, I’m modeling spin, drag and magnus. With 30 samples per second, I wouldn’t need to do that at all. It would be built into the observations.

It would also be a cleaner boundary between the artifacts. CV is raw, insights is interpreted.