Added non-functional Gnome Shell extension
Fixed a typo
Cleaned up some extension code
Gnome Shell extension is now partially functional. The wallpaper thumbnail and some labels are displayed, and the Open and Delete menu times work. Delete moves the wallpaper to trashcan.
New menu option "Show in File Manager" for the Gnome Shell extension
The Gnome Shell extension is now fully functional. The menu options "Next Wallpaper", "Fit Time of Day", and "Settings" are now functional.