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/BulletinRequest.cs

@@ -0,0 +1,69 @@
+using FSO.Common.Serialization;
+using FSO.Server.Protocol.Electron.Model;
+using Mina.Core.Buffer;
+
+namespace FSO.Server.Protocol.Electron.Packets
+{
+    public class BulletinRequest : AbstractElectronPacket, IActionRequest
+    {
+        public BulletinRequestType Type;
+        public uint TargetNHood; //the bulletin board to use
+
+        //post message
+        public string Title = "";
+        public string Message = "";
+        public uint LotID; //0 if empty - optionally reference a lot in this bulletin post
+
+        //post message, delete message, promote message
+        public uint Value; //bulletin type if post, bulletin ID otherwise.
+
+        public object OType => Type;
+        public bool NeedsValidation => false; //the CAN POST items are one off requests, rather than a state machine.
+
+        public override void Deserialize(IoBuffer input, ISerializationContext context)
+        {
+            Type = input.GetEnum<BulletinRequestType>();
+            TargetNHood = input.GetUInt32();
+
+            if (Type == BulletinRequestType.POST_MESSAGE || Type == BulletinRequestType.POST_SYSTEM_MESSAGE)
+            {
+                Title = input.GetPascalString();
+                Message = input.GetPascalString();
+                LotID = input.GetUInt32();
+            }
+            Value = input.GetUInt32();
+        }
+
+        public override ElectronPacketType GetPacketType()
+        {
+            return ElectronPacketType.BulletinRequest;
+        }
+
+        public override void Serialize(IoBuffer output, ISerializationContext context)
+        {
+            output.PutEnum(Type);
+            output.PutUInt32(TargetNHood);
+
+            if (Type == BulletinRequestType.POST_MESSAGE || Type == BulletinRequestType.POST_SYSTEM_MESSAGE)
+            {
+                output.PutPascalString(Title);
+                output.PutPascalString(Message);
+                output.PutUInt32(LotID);
+            }
+            output.PutUInt32(Value);
+        }
+    }
+
+    public enum BulletinRequestType : byte
+    {
+        GET_MESSAGES = 0,
+        POST_MESSAGE,
+        PROMOTE_MESSAGE, //mayor/admin only.
+        CAN_POST_MESSAGE,
+        CAN_POST_SYSTEM_MESSAGE,
+
+        //admin
+        POST_SYSTEM_MESSAGE,
+        DELETE_MESSAGE,
+    }
+}