**OlcbIoNode Sketch**

Implements function equivalent to the Railstars Io board, and the associated DevKit.  

-  8 producers (inputs) with a pair of eventids
-  8 consumers (outputs) with a pair of eventids

Good example of use of CDI, ButtonLeds, etc.  

References:
-  https://openlcb.org/knowledge-base/railstars/
-  https://github.com/Railstars/Io
-  https://sourceforge.net/p/openlcb/svn/HEAD/tree/trunk/prototypes/hardware/r-io/
-  https://sourceforge.net/p/openlcb/svn/HEAD/tree/trunk/prototypes/hardware/DevKit/
