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* Dispose of images after using them Adds ImageInfo.clone, ImageInfo.dispose, and ImageInfo.isCloneOf. Makes all stateful holders of ui.Image objects properly clone and dispose of them. Behavior change for ImageStreamCompleter: Removing the last listener after registering at least one listener results in the object being disposed, and new listeners cannot be added, unless a keepAlive handle is created. Makes all non-stateful holders of ui.Image (i.e. paintImage and RawImage) assert that whoever gave the image to them has not disposed it on them.