ScaleX = function (items, value, step, index, direction)
{
    return PropertyValueInc(items, 'scaleX', value, step, index, direction);
}
Takes an array of Game Objects, or any objects that have a public `scaleX` property,
and then adds the given value to each of their `scaleX` properties.

The optional `step` property is applied incrementally, multiplied by each item in the array.

To use this with a Group: `ScaleX(group.getChildren(), value, step)`

@function Phaser.Actions.ScaleX
@since 3.0.0

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

@param {(array|Phaser.GameObjects.GameObject[])} items - The array of items to be updated by this action.
@param {number} value - The amount to be added to the `scaleX` property.
@param {number} [step=0] - This is added to the `value` amount, multiplied by the iteration counter.
@param {number} [index=0] - An optional offset to start searching from within the items array.
@param {number} [direction=1] - The direction to iterate through the array. 1 is from beginning to end, -1 from end to beginning.

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