Removed NioTSO client and server

- NioTSO client isn't needed because we're using RayLib
- Added FreeSO's API server to handle most backend operations

server/FSO.Server.Protocol/Gluon/Packets/SendCityMail.cs

@@ -0,0 +1,58 @@
+using FSO.Common.Serialization;
+using FSO.Files.Formats.tsodata;
+using Mina.Core.Buffer;
+using System.Collections.Generic;
+using System.IO;
+
+namespace FSO.Server.Protocol.Gluon.Packets
+{
+    public class SendCityMail : AbstractGluonCallPacket
+    {
+        public List<MessageItem> Items { get; set; }
+
+        public SendCityMail() { }
+
+        public SendCityMail(List<MessageItem> items) {
+            Items = items;
+        }
+
+        public override void Deserialize(IoBuffer input, ISerializationContext context)
+        {
+            base.Deserialize(input, context);
+            var itemCount = input.GetInt32();
+            var dataSize = input.GetInt32();
+            var data = input.GetSlice(dataSize).GetBytes();
+            using (var mem = new MemoryStream(data)) {
+                Items = new List<MessageItem>();
+                for (int i = 0; i < itemCount; i++)
+                {
+                    var message = new MessageItem();
+                    message.Read(mem);
+                    Items.Add(message);
+                }
+            }
+        }
+
+        public override void Serialize(IoBuffer output, ISerializationContext context)
+        {
+            base.Serialize(output, context);
+            byte[] data = null;
+            using (var mem = new MemoryStream())
+            {
+                foreach (var item in Items)
+                {
+                    item.Save(mem);
+                }
+                data = mem.ToArray();
+            }
+            output.PutInt32(Items.Count);
+            output.PutInt32(data.Length);
+            output.Put(data);
+        }
+
+        public override GluonPacketType GetPacketType()
+        {
+            return GluonPacketType.CitySendMail;
+        }
+    }
+}