Trajectory of missiles are off when there is significant terrain differences

[Garanas]

Describe the bug

In a replay:

https://github.com/FAForever/fa/assets/15778155/15c59abe-cc75-4db8-b91d-a55ad195d066

In a sandboxed environment:

https://github.com/FAForever/fa/assets/15778155/fc4b9f22-24f8-4762-af1d-9fc977334f60

Specifically the Cybran MML has trouble shooting at something that is significant higher.

To Reproduce

Apply an attack ground order to something that is significantly higher than the MML. It tends to overshoot.

[Garanas]

@clyfordv would you be available to look into this?

[clyfordv]

I am, I'll check it out.

[clyfordv]

Contemporary to this I'm aiming to balkanize SemiBallisticProjectile (a borderline nonsense name if I've ever heard one) into a set of ballistic equations with a class-friendly parameter format, to be included as needed.