CopyFrom = function (source, dest)
{
    return dest.setTo(source.x, source.y, source.radius);
}
Copies the `x`, `y` and `radius` properties from the `source` Circle
into the given `dest` Circle, then returns the `dest` Circle.

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

@generic {Phaser.Geom.Circle} O - [dest,$return]

@param {Phaser.Geom.Circle} source - The source Circle to copy the values from.
@param {Phaser.Geom.Circle} dest - The destination Circle to copy the values to.

@return {Phaser.Geom.Circle} The destination Circle.