Choose Wallpaper Folder and Rotate Through Wallpapers

## Prerequisites
- [x ] I have searched open and closed issues for duplicates.

## Feature

**Describe the solution you'd like**
It would be nice to be able to chose your wallpaper folder. Secondly the ability to auto cycle through them without a third party app.

**Existing work**
Need third party app to do this now.

**Describe alternatives you've considered**
Third party app

---
Want to back this issue? **[Post a bounty on it!](https://www.bountysource.com/issues/86977892-choose-wallpaper-folder-and-rotate-through-wallpapers?utm_campaign=plugin&utm_content=tracker%2F57462545&utm_medium=issues&utm_source=github)** We accept bounties via [Bountysource](https://www.bountysource.com/?utm_campaign=plugin&utm_content=tracker%2F57462545&utm_medium=issues&utm_source=github).