Adds "fill" arrange modes to the Align Tool
The Align Tool had to be used in a very hacky way if one intended to evenly distribute items across an image, or other reference object (it would actually require one to calculate the item spacing out of GIMP). This adds vertical and horizontal fill modes: the reference object is divided in N equal segments, where N is the number of items, and each item is placed in the center of one of these segments. The existing "offset" parameter is used as an extra margin for the distribution, and can be set to negative values, so that the items can even get moved outside the boundaries of the reference object.
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