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/Voltron/DataService/Bookmark.cs

@@ -0,0 +1,13 @@
+namespace FSO.Server.Protocol.Voltron.DataService
+{
+    public class Bookmark
+    {
+        public uint Bookmark_TargetID { get; set; }
+        public BookmarkType Bookmark_Type { get; set; }
+    }
+
+    public enum BookmarkType : byte
+    {
+        BOOKMARK = 0x01
+    }
+}