Function graphics::math::least_separation_4

pub fn least_separation_4<T>(
    sep1: Vec2d<T>, 
    sep2: Vec2d<T>, 
    sep3: Vec2d<T>, 
    sep4: Vec2d<T>
) -> Vec2d<T> where
    T: Float, 

Returns the least separation out of four. Each seperation can be computed using separation function. The separation returned can be used to solve collision of rectangles.