[Mono-dev] Single thread scheduler for Threading.Timers patch

[Rafael Ferreira]

Howdy, 

The attached patch changes the current Threading.Timer class to use a
single thread scheduler instead of the current 1 thread per timer logic.
I also spent a lot of time working on the Timer unit tests so they more
consistently pass as well as fixing the "NotWorking" tests. 

Some key features include:

* A single thread handles firing all timer jobs thus allowing a much
greater number of Timers to be defined - Fixing bug #65734
* Timer scheduler is only started after the first System.Threading.Timer
is created (lazy init)
* Timer scheduler thread dies if there are no more timer jobs in its Job
queue (early termination)
* Scheduler can spit out debug info by exporting the MONO_TIMER_DEBUG
environment variable

Of course, I don't expect this patch to be accepted without some degree
of scrutiny so comments/concerns are appreciated and I can commit the
code once we're all comfortable with it.  

Cheers, 

- raf



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