PW 3.0.17: Major upgrades to images field

[tpr]

When inserting an image using the CKEditor toolbar button, the modal that comes up shows the thumbnails but the names are not shown anywhere:

Names are visible only in the url on hovering the image, or on the next step after clicking on the image. It's kinda OK to me as a developer but not for the clients (actually this issue was raised by one of them). It would be better to show the filename under the image.