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.Database/DA/DbEvents/DbGenericAvatarParticipation.cs

@@ -0,0 +1,8 @@
+namespace FSO.Server.Database.DA.DbEvents
+{
+    public class DbGenericAvatarParticipation
+    {
+        public string participation_name { get; set; }
+        public uint participation_avatar { get; set; }
+    }
+}