ENH: Correct model heading

[KCollins]

Description

Currently the model slides along the track without changing its orientation, but it'd be nice to make the heading correct.

video of current behavior: https://www.youtube.com/watch?v=TTRI8tAi6Bs

Potential impact

Not critical but might be nice for visualizing anything close up.

Potential solution(s)

• Compute heading: arcsin((y2-y1)/(x2-x1)) for each timestep
• Add model rotation

Alternatives

Should check OpenSpace Slack to see if this has already been implemented.