Added subscriptions management

FoxTube.Core/UserManagement.cs

@@ -27,13 +27,13 @@ namespace FoxTube
 		#region Private members
 		private static readonly ApplicationDataContainer storage = ApplicationData.Current.LocalSettings;
 
-		private static ExtendedYouTubeService _defaultService = new ExtendedYouTubeService(new Google.Apis.Services.BaseClientService.Initializer
+		private static readonly ExtendedYouTubeService _defaultService = new ExtendedYouTubeService(new Google.Apis.Services.BaseClientService.Initializer
 		{
 			ApplicationName = "FoxTube",
 			ApiKey = "AIzaSyBgHrCnrlzlVmk0cJKL8RqP9Y8x6XSuk_0",
 			//ApiKey = "AIzaSyD7tpbuvmYDv9h4udo9L_g3r0sLPFAnN00"
 		});
-		private static YoutubeClient _defaultYteClient = new YoutubeClient();
+		private static readonly YoutubeClient _defaultYteClient = new YoutubeClient();
 
 		private static string[] Scopes { get; } = new string[]
 		{
@@ -131,6 +131,7 @@ namespace FoxTube
 
 				await CurrentUser.Credential.RevokeTokenAsync(CancellationToken.None);
 
+				storage.Values.Remove($"Subscriptions.{CurrentUser.UserInfo.Id}");
 				CurrentUser = null;
 				Users[Users.ToList().FindIndex(i => i.Id == userId)] = null;
 
@@ -201,5 +202,8 @@ namespace FoxTube
 			else
 				vaultCredential.Password = refreshToken;
 		}
+
+		internal static void SubscriptionsChangedInvoker(User sender, Subscription subscription) =>
+			SubscriptionsChanged?.Invoke(sender, subscription);
 	}
 }