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/Relationships/DbRelationship.cs

@@ -0,0 +1,12 @@
+namespace FSO.Server.Database.DA.Relationships
+{
+    public class DbRelationship
+    {
+        public uint from_id { get; set; }
+        public uint to_id { get; set; }
+        public int value { get; set; }
+        public uint index { get; set; }
+        public uint? comment_id { get; set; }
+        public uint date { get; set; }
+    }
+}