Updated reference channel entities

ref/Enums/ModelState.cs

@@ -0,0 +1,18 @@
+namespace Discord
+{
+    public enum ModelState : byte
+    {
+        /// <summary> Message did not originate from this session, or was successfully sent. </summary>
+		Normal = 0,
+        /// <summary> Message is current queued. </summary>
+		Queued,
+        /// <summary> Message was deleted. </summary>
+        Deleted,
+        /// <summary> Message was deleted before it was sent. </summary>
+        Aborted,
+        /// <summary> Message failed to be sent. </summary>
+		Failed,
+        /// <summary> Message has been removed from cache and will no longer receive updates. </summary>
+        Detached
+    }
+}