added: #define for the enc28j60 reset pin
fixed: only make the reset pin output once
added: enable the watchdog timer, set the timeout to 8 seconds, the WDT_ON bit in the high fuse byte should be programmed to zero
added: reset the watchdog timer for one minute after meaningful art-net data has been received
added: reset port address and portreplytimeout when dhcp address is renewed
added: when the ip address from dhcp is renewed, send an artpollreply
added: if data is received on art-net port minus one, send the artpollreply immediately, but as unicast
added: enable flow control when transmitting data to the leds