JS Vector2D should use XZ instead of XY

[elexis]

In the engine we use Y for the elevation and X and Z for the horizonal plane.

r9096 introduced the Vector JS object which uses X and Y. This is now in globalscripts/ and used in not few places. In many if not all places, the Y represents Z.

So it would be much more clear if it would use X and Z.

rP9271 made some effort going into the same direction.

There is also a Vector2D.h class that also uses Y with the same issue in most if not all simulation uses.

Perhaps we could have VectorXY and VectorXZ that inherit the same class.

[elexis]

In 20388:

rmgen cleanup.

Remove PointXZ class which is essentially a subset of Vector2D, refs #4834, #4804.
Remove Point3D which is unused and the same as Vector3D without the math features, refs #4805.

[Imarok]

As far as I can see that's a good idea. Though you would also have to change the C++ 2D-Vector (CFixedVector2D) because we sometimes convert between the JS and the C++ ones.

[Imarok]

Move tickets to their correct component as "UI & Simulation" got some sub components.

[Vladislav Belov]

Vector2D might be still useful for real 2D math, so I'd prefer to have a different class (might be inherited) with a proper naming, like VectorXZ, VectorHorizontal2D or VectorH2D.