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/MatchmakerNotify.cs

@@ -0,0 +1,40 @@
+using FSO.Common.Serialization;
+using Mina.Core.Buffer;
+
+namespace FSO.Server.Protocol.Gluon.Packets
+{
+    /// <summary>
+    /// Lot -> City server messages used to notify the matchmaker about some change to lot state.
+    /// (currently only when an avatar leaves a lot. this frees up a space for the matchmaker to shove someone else in)
+    /// </summary>
+    public class MatchmakerNotify : AbstractGluonPacket
+    {
+        public MatchmakerNotifyType Mode;
+        public uint LotID;
+        public uint AvatarID; 
+
+        public override void Deserialize(IoBuffer input, ISerializationContext context)
+        {
+            Mode = input.GetEnum<MatchmakerNotifyType>();
+            LotID = input.GetUInt32();
+            AvatarID = input.GetUInt32();
+        }
+
+        public override GluonPacketType GetPacketType()
+        {
+            return GluonPacketType.MatchmakerNotify;
+        }
+
+        public override void Serialize(IoBuffer output, ISerializationContext context)
+        {
+            output.PutEnum(Mode);
+            output.PutUInt32(LotID);
+            output.PutUInt32(AvatarID);
+        }
+    }
+
+    public enum MatchmakerNotifyType : byte
+    {
+        RemoveAvatar = 1
+    }
+}