add channels infrastructure

MediaBrowser.Controller/Channels/Channel.cs

@@ -1,9 +1,21 @@
 using MediaBrowser.Controller.Entities;
+using System;
+using System.Linq;
 
 namespace MediaBrowser.Controller.Channels
 {
     public class Channel : BaseItem
     {
         public string OriginalChannelName { get; set; }
+
+        public override bool IsVisible(User user)
+        {
+            if (user.Configuration.BlockedChannels.Contains(Name, StringComparer.OrdinalIgnoreCase))
+            {
+                return false;
+            }
+            
+            return base.IsVisible(user);
+        }
     }
 }