Since V3.5.1 the advanced image editor is included, that allows to set custom masks (cropping), more filters and to manipulate the image color of JPEG and PNG images.
If you want to offer more custom mask shapes than the free-hand cropping, you enable to create a new directory in the wp-content/uploads of your WordPress directory and name it fpd_masks.
You can only use SVG images as masks, which includes one single path. Only the first path of the uploaded SVG is used as mask shape. Upload the SVG images to the fpd_masks directory.