Hopefully the other changes herein have rendered
cleanupnodes obsolete, but I'm not too sure of
that.....

I'm uncommenting a bunch of LJ code that was never
committed uncommented, so I might be breaking something
horribly here....

We need to send the ackret, first of all!

Allow connecting to localhost / 127.0.0.1

See merge request !474

Because IPv6 doesn't seem to work anyway.

-noxinput and -nohidapi command line parameters.

See merge request STJr/SRB2!468

Error if the lump is a PNG lump

See merge request STJr/SRB2!466

This reverts commit d03c5393.

Notably over chat.