Feature: Option to randomize wallpapers every 5 minutes

[chrissolanilla]

Hi, I really like the easy of use that waypaper provides. One thing that I usually have when it comes to wall papers is for it to randomly change to a different image after a certain amount of time. Usually I achieve this with a script. When it comes to other operating systems that are not Linux, they support this out of the box sometimes. I would like to propose this idea, and will try to fork my own copy of this repository but with an additional button or option to randomize the wallpaper after some time like 1 minute, 5 minutes, 30 minutes, 1 hour.