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.Api.Core/Models/FSOUpdateManifest.cs

@@ -0,0 +1,10 @@
+using FSO.Files.Utils;
+using System.Collections.Generic;
+
+namespace FSO.Server.Api.Core.Models
+{
+    public class FSOUpdateManifest {
+        public string Version;
+        public List<FileDiff> Diffs;
+    }
+}