ImageCropOptions should be refactored as generic CropSourceOptions which implement TransformationSourceOptions added in
Cropping may apply to video and other source mimetypes besides video.
Like PagedSourceOptions and TemporalSourceOptions, CropSourceOptions should contain a serializer responsible for conversions related to renditions.
The ImageMagick transformer and ImageRenderingEngine should be refactored for the new CropSourceOptions.
Backwards compatibility with existing uses and extensions of ImageCropOptions must be considered. Perhaps an ImageCropOptions class which extends CropSourceOptions could be left in place and marked as deprecated.