This plugin takes two image filenames and loads them into RAM. The first image is returned immediately, the second image is loaded in the background and will be returned when the plugin is called again.
It is assumed that all images have the same size. If this is not the case, call release(image) before getting the second image.
Ext.CLIJx_preloadFromDisc(Image destination, String filename, String nextFilename, String loaderId);