/include works

I've added a full cubescript system for dealing with /tu:include, and
basically, map creators can add this to their map's cfg (assuming the
pack is called "hello" and it can be obtained from
"http://example.com/hello.zip":
"include hello example.com/hello.zip"

It's pretty neat-o. Devblog update expected shortly.
deleting profane content

Note to self: Do not include a random insult from The Thick of It as
your test document.