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/Electron/Packets/MailRequest.cs

@@ -0,0 +1,70 @@
+using FSO.Common.Serialization;
+using FSO.Files.Formats.tsodata;
+using Mina.Core.Buffer;
+using System.IO;
+
+namespace FSO.Server.Protocol.Electron.Packets
+{
+    public class MailRequest : AbstractElectronPacket
+    {
+        public MailRequestType Type;
+        public long TimestampID;
+        public MessageItem Item;
+
+        public override void Deserialize(IoBuffer input, ISerializationContext context)
+        {
+            Type = input.GetEnum<MailRequestType>();
+            if (Type == MailRequestType.SEND) { 
+                var length = input.GetInt32();
+                var dat = new byte[length];
+                for (int i=0; i<length; i++)
+                {
+                    dat[i] = input.Get();
+                }
+
+                using (var str = new MemoryStream(dat))
+                {
+                    Item = new MessageItem(str);
+
+                }
+            } else
+            {
+                TimestampID = input.GetInt64();
+            }
+        }
+
+        public override ElectronPacketType GetPacketType()
+        {
+            return ElectronPacketType.MailRequest;
+        }
+
+        public override void Serialize(IoBuffer output, ISerializationContext context)
+        {
+            output.PutEnum(Type);
+            if (Type == MailRequestType.SEND)
+            {
+                byte[] dat;
+                if (Item == null) dat = new byte[0];
+                else
+                {
+                    using (var str = new MemoryStream())
+                    {
+                        Item.Save(str);
+                        dat = str.ToArray();
+                    }
+                }
+                output.PutInt32(dat.Length);
+                foreach (var b in dat)
+                    output.Put(b);
+            } else
+                output.PutInt64(TimestampID);
+        }
+    }
+
+    public enum MailRequestType : byte
+    {
+        POLL_INBOX,
+        SEND,
+        DELETE
+    }
+}