Allow crossOrigin and alt to be controlled
Allow crossOrigin and alt to be controlled

- crossOrigin="anonymous" can sometimes break croppers using data-url based images
  - Cropper already handles crossOrigin itself so default to that attribute not being present
- "picture" is not always the best alt, so also allow that to be controlled

roadmanfong/react-cropper,alantrrs/react-cropper,favorit/react-cropper,bearoplane/react-cropper,favorit/react-cropper,TAPP-TV/react-cropperjs,dantman/react-cropper,roadmanfong/react-cropper,dantman/react-cropper,alantrrs/react-cropper,bearoplane/react-cropper,TAPP-TV/react-cropperjs