Added ControllerExtensions to be used instead of HtmlViewRenderer for net8

Added HttpException class for missing HttpException for net8

Wrapped HttpContext.Session, GetJsonResult, IsAjaxRequest and GetUserIdentityName in controllers for net8

Added AuthenticationService to test Fab2ApprovalMKLink code for net8

Compile conditionally flags to debug in dotnet core

Fab2ApprovalSystem/Utilities/FileUtilities.cs

@@ -20,6 +20,7 @@ using System.Configuration;
 namespace Fab2ApprovalSystem.Utilities;
 
 #if !NET8
+
 public class FileUtilities<T> : Controller // <T> => System.Web.Mvc.FileContentResult
 {
 
@@ -28,14 +29,22 @@ public class FileUtilities<T> : Controller // <T> => System.Web.Mvc.FileContentR
         var result = File(fileBytes, System.Net.Mime.MediaTypeNames.Application.Octet, pathToFile);
         return (T)Convert.ChangeType(result, typeof(T));
     }
-#else
+
+#endif
+
+#if NET8
+
 public class FileUtilities<T> {
+
 #endif
 
     public byte[] GetFile(string s) {
+
 #if !NET8
         FileStream fs = System.IO.File.OpenRead(s);
-#else
+#endif
+
+#if NET8
         FileStream fs = File.OpenRead(s);
 #endif
         byte[] data = new byte[fs.Length];