Adds a Blank Screen option, to turn the screen off, to the User Menu(aka status menu). Also works from, and doesn't close, the Activites Overview. Useful if you have a long lock time set and/or just want to turn the screen off without locking it. Credit to xtranophilist.
Much credit to Obsidien for his help and code skills, I suggest you check out his amazing work:
https://extensions.gnome.org/extension/242/blank-screen/
The included zip can be used to install via gnome-tweak-tool. After installing with gtt a shell restart may be required, Alt+F2, r, Enter.
