This adds the "show stats", "stats record", etc. commands and information on available Threadpool threads, etc.
It also adds the Watchdog which logs warnings if time between executions is unexpectedly large.
Despite the comments in the code, it appears that the issue where the .NET performance counter was wrongly idle time time on Mono was fixed in 2009.
https://bugzilla.novell.com/show_bug.cgi?id=468625
Which means that the workaround is no longer necessary and produces bad results instead.
This was the original intention with these stats, as I didn't believe they would be useful to ordinary users if everything is working as it should.
Please amend if this is an issue.
Just for now, levels actually have no impact on what is displayed via the "show stats" command.