Internal add hash to login form for all logins, fix registration patch

Core/PluginHash.cs

@@ -0,0 +1,14 @@
+using System;
+using System.IO;
+using System.Reflection;
+using System.Security.Cryptography;
+
+namespace undead_universal_patch_il2cpp.Core;
+
+public class PluginHash
+{
+    public static string GetHash()
+    {
+        return BitConverter.ToString(MD5.Create().ComputeHash(File.OpenRead(Assembly.GetExecutingAssembly().Location))).Replace("-", "").ToLowerInvariant();
+    }
+}