Manual crop function

It would be lovely if we could manually crop an image inside the CMS. When adding your image to a region, there should be an option to drag/zoom the image inside the cropped box.

This would be especially useful for the gallery app, as it seems a bit pointless having a batch upload if you then have to go and upload a bunch of thumbnails individually afterwards. However I'm aware the gallery app needs some work linking up with the categories and assets.