Auto update Telerik web.config entries and perf fix for hidden file check

• This build automatically applies missing Telerik's security related web.config entries. Upon first load of Security Analyzer, you may see Telerik web.config related warning. The warning should go away after a page refresh.

• Often Security Analyzer timed out during first load on sites with larger number of files. We have moved that functionality out. Now, you can click on a button to run that separately. We are seeing running it manually to be not causing any timeouts.