Implemented auto-update using Squirrel

Reworked SettingsPageView to not need a Save Button and added a folder browser control

Filtration.Interface/IDocument.cs

@@ -1,4 +1,6 @@
 using System.Threading.Tasks;
+using System.Windows.Input;
+using GalaSoft.MvvmLight.CommandWpf;
 
 namespace Filtration.Interface
 {
@@ -7,5 +9,6 @@ namespace Filtration.Interface
         bool IsScript { get; }
         bool IsTheme { get; }
         Task Close();
+        RelayCommand CloseCommand { get; }
     }
 }