Feature Request: Read contents of file manager directory

[luya-bot]

This issue has originally been reported by @rolandschaub at https://github.com/luyadev/luya/issues/1353. Moved here by @nadar.

---

There are situations, where it would be good to read all files from a directory created in the file manager. Example: Let's create an image gallery block. Instead of having to add dozens of images manually, the block could allow to select a file manager directory and then include all image files in this directory in the gallery (probably sorted by file name).