Get it sort-of-mostly working in "Old Engine" HL2HEADmaster

While we're at it, come up with a way for certain gamedata matches to be
Windows-only. Somewhat reduces ifdef usage, although does not entirely
remove it of course.

Tested in HL2 2707. Haven't tested other HL2 builds, or Episode 1.
Doesn't seem to work in DMoMM yet either; not sure why.

A big list of stuff still to fix follows.

Hidden cvars are currently an issue. We still need to figure out what to
do with the flag bits because FCVAR_HIDDEN just doesn't exist in OE and
there's some other flag with the same value instead.

We also need to do something about the flag setting in fixes.c since
HIDDEN is again not a thing, and also DEVONLY is not a thing either.

When the plugin is autoloaded, all the initial log text gets eaten,
because there's some stupid crap we have to do to trick the engine into
displaying coloured text otherwise it just won't. Not even stuff from
Warning(). Very stupid, but Hayden already figured out a solution, so
that'll be done in another upcoming commit.

Apparently raw mouse input breaks the menu. We might need to bump up the
priority on making that hook only be active when there's no UI open -
something I wanted to do anyway due to the demo drive issues.

Big thanks to Hayden for doing a lot of the initial groundwork on this,
particularly the cvar registration stuff. He gets a copyright notice in
con_.c even though I ended up doing a lot of stuff differently because
quite a bit of his work is still in there.

Don't blame him for the self-modifying code though, that was my crazy
idea. Sorry, but, in my defence... Well, it works.

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