Offset = function (line, x, y)
{
    line.x1 += x;
    line.y1 += y;

    line.x2 += x;
    line.y2 += y;

    return line;
}
Offset a line by the given amount.

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

@generic {Phaser.Geom.Line} O - [line,$return]

@param {Phaser.Geom.Line} line - The line to offset.
@param {number} x - The horizontal offset to add to the line.
@param {number} y - The vertical offset to add to the line.

@return {Phaser.Geom.Line} The offset line.