we now use an enum similar to UE4 with Fatal, Error, Warning, Display, Log, Verbose, and VeryVerbose
Log will only go to the log file unless -verbose is passed on the command line
reduced some of the output from UAT to be Log only
[CL 2631062 by Peter Sauerbrei in Main branch]
* Remove ErrorReporter.Error, replace with AutomationException with Error Code.
* Move ErrorCodes to AutomationException.
* Don't return exit codes. Solely rely on exceptions to propagate exit codes.
* Remove MainProc delegate
* Remove setting of Environment.ExitCode as it is ignored when main returns an int.
* ShutdownLogging is nothrow, as all exceptions would be ignored anyway.
* Wrap all shutdown steps so further ones get a chance to run.
* Move HostPlatform.Initialize into the global try/catch block
#codereview:ben.marsh
[CL 2605826 by Wes Hunt in Main branch]
