Backend: LorenzVec up/down and drawLineToEye

[ItsEmpa]

Adds a .up() and .down() methods to lorenzvec, and uses them in all cases where its useful instead of adding a vector with a specific y value. also adds drawLineToEye method, and a couple other cleanup functions related to lorenzvec

Changelog Technical Details

• Cleaned up LorenzVec and added drawLineToEye. - Empa