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This makes servo use less file descriptors for animated images and avoids the crash described in https://github.com/servo/servo/issues/36792. Doing this also forces the end users to be more explicit about whether they want to deal with all image frames or just the first one. Previously, `Image::bytes` silently returned only the data for the first frame. With this change there's now a `frames` method which returns an iterator over all frames in the image. Testing: No tests - this simply reduces the number of fds used. Servo doesn't currently display animated gifs anyways. Fixes: https://github.com/servo/servo/issues/36792 Signed-off-by: Simon Wülker <simon.wuelker@arcor.de>