Make optional show files in gnome core apps from the Download directory

[Bastián Díaz <diaz bastian openmailbox org>]

Please add an option (perhaps in dconf) that gnome core apps don't 
display files from download directory. Usually the download directory is 
a folder where your files are stored temporarily before being processed 
and stored elsewhere as the "Documents", "Music", "Photo" folder, etc.

Download folder is our Inbox and receive all kinds of files from the 
internet, bluetooth connections and other sources. It's annoying to open 
gnome-documents and view files that you dont want to have there, see 
images of icons on a web page downloaded or application in gnome-photos 
or sounds and recording of the last meeting that play in gnome-music by 
mistake.

It has happened many times and I have to constantly clean my Downloads 
folder to prevent this behavior. However, I believe that strongly 
influences the user workflow and therefore I propose it as a 
configuration option in dconf.

Cheers