ProjectUnit = function (pointA, pointB, out) {
    if (out === undefined) { out = new Point(); }

    var amt = ((pointA.x * pointB.x) + (pointA.y * pointB.y));

    if (amt !== 0) {
        out.x = amt * pointB.x;
        out.y = amt * pointB.y;
    }

    return out;
}
[description]

@function Phaser.Geom.Point.ProjectUnit
@since 3.0.0

@generic {Phaser.Geom.Point} O - [out,$return]

@param {Phaser.Geom.Point} pointA - [description]
@param {Phaser.Geom.Point} pointB - [description]
@param {Phaser.Geom.Point} [out] - [description]

@return {Phaser.Geom.Point} [description]