Gradient Map for Construct 2

This is a tool for creating a gradient map in Construct 2.  A gradient map essentially replaces the colors of an image based on the image's value.  Starting with a greyscale image, it maps one end of the gradient to dark colors and the other end to lights, covering all values in between. This is fairly easy to do in Photoshop (there's just a Gradient Map adjustment layer) but to do this in Constru…