Update API models to fully support rich embeds

src/Discord.Net.Core/API/Common/Embed.cs

@@ -13,9 +13,17 @@ namespace Discord.API
         public string Description { get; set; }
         [JsonProperty("url")]
         public string Url { get; set; }
+        [JsonProperty("color")]
+        public uint Color { get; set; }
+        [JsonProperty("author")]
+        public Optional<EmbedAuthor> Author { get; set; }
+        [JsonProperty("footer")]
+        public Optional<EmbedFooter> Footer { get; set; }
         [JsonProperty("thumbnail")]
         public Optional<EmbedThumbnail> Thumbnail { get; set; }
         [JsonProperty("provider")]
         public Optional<EmbedProvider> Provider { get; set; }
+        [JsonProperty("fields")]
+        public Optional<EmbedField[]> Fields { get; set; }
     }
 }

src/Discord.Net.Core/API/Common/EmbedAuthor.cs

@@ -0,0 +1,16 @@
+using Newtonsoft.Json;
+
+namespace Discord.API
+{
+    public class EmbedAuthor
+    {
+        [JsonProperty("name")]
+        public string Name { get; set; }
+        [JsonProperty("url")]
+        public string Url { get; set; }
+        [JsonProperty("icon_url")]
+        public string IconUrl { get; set; }
+        [JsonProperty("proxy_icon_url")]
+        public string ProxyIconUrl { get; set; }
+    }
+}

src/Discord.Net.Core/API/Common/EmbedField.cs

@@ -0,0 +1,14 @@
+using Newtonsoft.Json;
+
+namespace Discord.API
+{
+    public class EmbedField
+    {
+        [JsonProperty("name")]
+        public string Name { get; set; }
+        [JsonProperty("value")]
+        public string Value { get; set; }
+        [JsonProperty("inline")]
+        public bool Inline { get; set; }
+    }
+}

src/Discord.Net.Core/API/Common/EmbedFooter.cs

@@ -0,0 +1,14 @@
+using Newtonsoft.Json;
+
+namespace Discord.API
+{
+    public class EmbedFooter
+    {
+        [JsonProperty("text")]
+        public string Text { get; set; }
+        [JsonProperty("icon_url")]
+        public string IconUrl { get; set; }
+        [JsonProperty("proxy_icon_url")]
+        public string ProxyIconUrl { get; set; }
+    }
+}