Levy Walk
class LevyWalk<T>(node: Node<T>, reaction: Reaction<T>, environment: Environment<T, Euclidean2DPosition>, randomGenerator: <Error class: unknown class>, speed: Double, scale: Double = 1.0, shape: Double = 1.0) : GenericRandomWalker<T>
Selects a target based on a random direction extracted from randomGenerator, and a random distance extracted from a ParetoDistribution of parameters scale and shape. Moves toward the targets at a constant speed and changes targets on collision.