Offset = function (rect, x, y)
{
    rect.x += x;
    rect.y += y;

    return rect;
}
Nudges (translates) the top left corner of a Rectangle by a given offset.

@function Phaser.Geom.Rectangle.Offset
@since 3.0.0

@generic {Phaser.Geom.Rectangle} O - [rect,$return]

@param {Phaser.Geom.Rectangle} rect - The Rectangle to adjust.
@param {number} x - The distance to move the Rectangle horizontally.
@param {number} y - The distance to move the Rectangle vertically.

@return {Phaser.Geom.Rectangle} The adjusted Rectangle.