imgur upload under account

Submitted by Simmo Saan

Assigned to Jérôme Guelfucci

Link to original bug (#12456)

Description

Currently there's two screenshot upload options:

1. ZimageZ with account login,
2. imgur anonymously.

Imgur has accounts as well and it'd be nice to be able to also make xfce4-screenshooter upload the screenshot under an account. It helps with managing uploaded screenshots on their website.