Initial commit
 - Has some bugs but I would like to keep versions now
Updated to use MVC programming pattern
Bug fixes
Rename to steam-game-mover to reduce confusion with existing "Steam Mover" software
Replaced DirPicker above lists with DirDialog invoking buttons. I think there's a GTK bug for DirPicker where events aren't fired unless the dialog is invoked. Apparently it works fine on Windows however.