Add Viktor Forgacs wallpaper

[cassidyjames]

• [x] I've read and followed the general guidelines
  • [x] Looks good in Pantheon on elementary OS
  • [x] Not too distracting if a non-maximized window is open
  • [x] No text or logos
  • [x] No people
  • [x] At least 3200×1800 px
• [ ] I've updated debian/copyright with:
  • [ ] The name of the wallpaper and/or its original author
  • [ ] A link to where it can be downloaded
  • [ ] Included under the respective license section (or created a new one if appropriate)
• [x] I've added the artist metadata using exiftool

  Why it should be included:

It's a pretty different wallpaper from the current set, but still seems to fit in color and composition-wise. Plus it's a more architectural shot, which we'd talked about looking into.

Screenshot(s) of it in Pantheon on elementary OS:

[micahilbery]

I'm :+1: on this the sky gradient is really pretty, it's nice and clear, and it triggers the light background transparent panel which we have less of.

[cemetary]

The correct name of the artist is Viktor Forgacs.

[4jNsY6fCVqZv]

how do you make sure that new wallpapers (even from unsplash) do not contain hidden malware or viruses?