forEach(callback, context, x, y, width, height, layer)
For each tile in the given area defined by x/y and width/height run the given callback.
Parameters
Name Type Argument Description callback number The callback. Each tile in the given area will be passed to this callback as the first and only parameter. context number The context under which the callback should be run. x number X position of the top left of the area to operate one, given in tiles, not pixels. y number Y po