[colorforth] network stack update

[Mark Slicker <maslicke@xxxxxxxxxxx>]

My latest effort can be found at:

http://personalwebs.oakland.edu/~maslicke/colorforth/networking/net.html

I have included a very simple DNS resolver. This is not recursive, but I
think it is sufficient for my purposes.

I have found a way to compile domain names from source, for example:

. (www) . (colorforth) . (com) end

encodes the domain www.colorforth.com where () means comment

I have updated the ethernet driver, it will not clear the interrupt
if there is a packet remaining. This should correct the issue previously
raised.

The DHCP client is updated to request the address of the DNS server.

I have also added some comments which were lacking before.

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