Removed PdfViewController, HtmlViewRenderer and FakeView to be replaced with ViewEngineResult Render method

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/Views/Admin/_AdminLayout.cshtml

@@ -34,7 +34,7 @@
             </div>
             <div class="navbar-collapse collapse">
                 <ul class="nav navbar-nav">            
-                    @if ((bool)@Session[GlobalVars.IS_ADMIN])
+                    @if (@GlobalVars.IsAdmin(Session))
                     { 
                         <li>@Html.ActionLink("Admin", "Index", "Admin")</li>
                     }