Clone = function (source)
{
    return new Circle(source.x, source.y, source.radius);
}
Creates a new Circle instance based on the values contained in the given source.

@function Phaser.Geom.Circle.Clone
@since 3.0.0

@param {(Phaser.Geom.Circle|object)} source - The Circle to be cloned. Can be an instance of a Circle or a circle-like object, with x, y and radius properties.

@return {Phaser.Geom.Circle} A clone of the source Circle.