Set for blink code

Set the main server program to be a dual 'threaded' program.  One
listens on a server for a byte and blinks one light based on the byte
read.
the other thread is a timed interupt and blinks another light on and off.
Extracted blinker

Extreacted blinker server from the main server code.  Cleaning up the
server code while also making it easier to launch either the blinker or
the main server.