ToggleVisible = function (items)
{
    for (var i = 0; i < items.length; i++)
    {
        items[i].visible = !items[i].visible;
    }

    return items;
}
Takes an array of Game Objects and toggles the visibility of each one.
Those previously `visible = false` will become `visible = true`, and vice versa.

@function Phaser.Actions.ToggleVisible
@since 3.0.0

@generic {Phaser.GameObjects.GameObject[]} G - [items,$return]

@param {(array|Phaser.GameObjects.GameObject[])} items - An array of Game Objects. The contents of this array are updated by this Action.

@return {(array|Phaser.GameObjects.GameObject[])} The array of Game Objects that was passed to this Action.