Improved internal websocket interfaces

src/Discord.Net/Entities/WebSocket/ICachedEntity.cs

@@ -1,6 +1,6 @@
 namespace Discord
 {
-    interface ICachedEntity<T> : IEntity<T>
+    internal interface ICachedEntity<T> : IEntity<T>
     {
         DiscordSocketClient Discord { get; }
     }

src/Discord.Net/Entities/WebSocket/ICachedGuildChannel.cs

@@ -2,5 +2,6 @@
 {
     internal interface ICachedGuildChannel : ICachedChannel, IGuildChannel
     {
+        new CachedGuild Guild { get; }
     }
 }