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/Bookmarks/DbBookmark.cs

@@ -0,0 +1,9 @@
+namespace FSO.Server.Database.DA.Bookmarks
+{
+    public class DbBookmark
+    {
+        public uint avatar_id { get; set; }
+        public byte type { get; set; }
+        public uint target_id { get; set; }
+    }
+}