Function wander 

pub fn wander(
    agent: &mut SteeringAgent,
    wander_circle_dist: f32,
    wander_circle_radius: f32,
    wander_jitter: f32,
) -> Vec2

Wander: random steering that produces smooth, organic movement.

wander_circle_dist — how far ahead the wander circle is projected wander_circle_radius — radius of the wander circle wander_jitter — how much the wander angle changes per call