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/MailResponse.cs

@@ -0,0 +1,69 @@
+using FSO.Common.Serialization;
+using Mina.Core.Buffer;
+using FSO.Files.Formats.tsodata;
+using System.IO;
+
+namespace FSO.Server.Protocol.Electron.Packets
+{
+    public class MailResponse : AbstractElectronPacket
+    {
+        public MailResponseType Type;
+        public MessageItem[] Messages = new MessageItem[0];
+
+        public override void Deserialize(IoBuffer input, ISerializationContext context)
+        {
+            Type = input.GetEnum<MailResponseType>();
+            var numMessages = input.GetInt32();
+            Messages = new MessageItem[numMessages];
+            for (int j = 0; j < numMessages; j++)
+            {
+                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))
+                {
+                    Messages[j] = new MessageItem(str);
+                }
+            }
+        }
+
+        public override ElectronPacketType GetPacketType()
+        {
+            return ElectronPacketType.MailResponse;
+        }
+
+        public override void Serialize(IoBuffer output, ISerializationContext context)
+        {
+            output.PutEnum(Type);
+            output.PutInt32(Messages.Length);
+            foreach (var msg in Messages)
+            {
+                byte[] dat;
+                using (var str = new MemoryStream())
+                {
+                    msg.Save(str);
+                    dat = str.ToArray();
+                }
+                output.PutInt32(dat.Length);
+                foreach (var b in dat)
+                    output.Put(b);
+            }
+        }
+    }
+
+    public enum MailResponseType
+    {
+        POLL_RESPONSE,
+        NEW_MAIL,
+        SEND_IGNORING_YOU,
+        SEND_IGNORING_THEM,
+        SEND_THROTTLED,
+        SEND_THROTTLED_DAILY,
+        SEND_FAILED,
+        SEND_SUCCESS //returns the message you sent, with its db id
+    }
+}