Isolated API definitions to their own library

src/Discord.Net.WebSocket/API/Gateway/ExtendedGuild.cs

@@ -1,25 +0,0 @@
-#pragma warning disable CS1591
-using Newtonsoft.Json;
-using System;
-
-namespace Discord.API.Gateway
-{
-    public class ExtendedGuild : Guild
-    {
-        [JsonProperty("unavailable")]
-        public bool? Unavailable { get; set; }
-        [JsonProperty("member_count")]
-        public int MemberCount { get; set; }
-        [JsonProperty("large")]
-        public bool Large { get; set; }
-
-        [JsonProperty("presences")]
-        public Presence[] Presences { get; set; }
-        [JsonProperty("members")]
-        public GuildMember[] Members { get; set; }
-        [JsonProperty("channels")]
-        public Channel[] Channels { get; set; }
-        [JsonProperty("joined_at")]
-        public DateTimeOffset JoinedAt { get; set; }
-    }
-}