SignalMgr like an Interrupt Bus...

I see the SignalMgr like an interrupt bus in CPU/OS.  Conceptually, a 
signal should be like an interrupt, that is, it should preempt all queue 
events and lower priority signals.  A signal should be enqueued 
unconditionally, so it must bypass load-conditioning policies like queue 
capacity.  We could have two kinds of signal: user and system.  A 
system-signal is when the source of the signal is Sandstorm.  So, 
handlers cannot send system-signal, only user-signal.  Signals should be 
handled by the EventHandler.handleEvent() method, like others kind of 
events.

By exemple, I would like to use this new SignalMgr to advertize all 
handlers that Sandstorm is shutting down.



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