More UI updates and cleanup

Application/Feeds/FeedReadResult.cs

@@ -0,0 +1,19 @@
+namespace FeedCenter;
+
+public enum FeedReadResult
+{
+    Success,
+    NotModified,
+    NotDue,
+    UnknownError,
+    InvalidXml,
+    NotEnabled,
+    Unauthorized,
+    NoResponse,
+    NotFound,
+    Timeout,
+    ConnectionFailed,
+    ServerError,
+    Moved,
+    TemporarilyUnavailable
+}