Add optional user/message/channel objects to Reactions

src/Discord.Net.WebSocket/Entities/Messages/SocketReaction.cs

@@ -8,17 +8,21 @@ namespace Discord.WebSocket
 {
     public class SocketReaction : IReaction
     {
-        internal SocketReaction(Model model)
+        internal SocketReaction(Model model, ISocketMessageChannel channel, Optional<SocketUserMessage> message, Optional<IUser> user)
         {
-            UserId = model.UserId;
+            Channel = channel;
+            Message = message;
             MessageId = model.MessageId;
-            ChannelId = model.ChannelId;
+            User = user;
+            UserId = model.UserId;
             Emoji = Emoji.FromApi(model.Emoji);
         }
 
         public ulong UserId { get; private set; }
+        public Optional<IUser> User { get; private set; }
         public ulong MessageId { get; private set; }
-        public ulong ChannelId { get; private set; }
+        public Optional<SocketUserMessage> Message { get; private set; }
+        public ISocketMessageChannel Channel { get; private set; }
         public Emoji Emoji { get; private set; }
     }
 }