S3ImageCropWidget v2.0

This widget includes the following enhancements or features:
* Improved UX.
* Cropping done completely at Client-Side. 
* Once cropping is done, you can see the Image cropped before even uploading.
* Fixed bugs or defects.

- This has been tested on modules like document, staff, volunteer and person registry in the default template.
Preferred style:
{"_type": "hidden",
 "_name": "imagecrop-data",
 "_class": "imagecrop-data",
 }