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This pull-request implements the feature of only loading the first frame of a GIF file.
It could help to save memory when loading a list (table view) of GIF file. Originally, all the GIFs will be loaded and animated. However, it is not a good idea to do so, since it will eat quite a lot of memory. Instead, we may want to load and decode the first frame of a GIF file as a preview or thumbnail. Then user could be navigated to a detail view will full, animating GIF image.