Perform automatic cropping of any image that has to be displayed with a specific aspect ratio

Although the editor has the option to crop each presentation image, an automatic cropping has to be applied just in case the editor does not crop the image to expect aspect ratio.

Without automatic cropping, the image scale will not be the one set through the Plone scale image, and only the proper width will be set but not the height.

Images that has to be displayed with a specific aspect ratio are: Upcoming event image (the image is displayed in the Upcoming events grid) Images of a past event (the images are displayed in the Images carrousel)