* Moved item filter script directory handling code to new ItemFilterScriptDirectorySerivce class

* Fixed issue #94 where the user was prompted to select their Path of Exile data directory after every upgrade.
* The default Path of Exile data directory is now automatically chosen on first run if it exists
* Moved CommonOpenFileDialog usage to new DialogService class
* Changed Custom Sounds code in ItemFilterScriptViewModel to use ItemFilterScriptDirectory instead of DefaultPathOfExileDirectory
* Moved Custom Sounds code from constructor to Initialise method to prevent the files being enumerated before the directory is set during startup

Filtration/WindsorInstallers/ServicesInstaller.cs

@@ -14,6 +14,11 @@ namespace Filtration.WindsorInstallers
                     .ImplementedBy<ItemFilterPersistenceService>()
                     .LifeStyle.Singleton);
 
+            container.Register(
+                Component.For<IItemFilterScriptDirectoryService>()
+                         .ImplementedBy<ItemFilterScriptDirectoryService>()
+                         .LifeStyle.Singleton);
+
             container.Register(
                 Component.For<IStaticDataService>()
                     .ImplementedBy<StaticDataService>()
@@ -43,6 +48,11 @@ namespace Filtration.WindsorInstallers
                 Component.For<ISettingsService>()
                     .ImplementedBy<SettingsService>()
                     .LifeStyle.Singleton);
+
+            container.Register(
+                Component.For<IDialogService>()
+                    .ImplementedBy<DialogService>()
+                    .LifeStyle.Singleton);
         }
     }
 }