Enable segment heap on Windows

[sfan5]

It turns out Microsoft has magic knobs you can turn to improve things, you just need to know about them.

this is supposed to help with #14015 and (allegedly) also lowers memory usage

@lhofhansl is probably in the best position to test this

according to the docs it only does something on version 2004 (build 19041) or later.

To do

This PR is Ready for Review.

How to test

❔

[lhofhansl]

I can take the artifacts generated by the build script and test it on the my son's desktop :)
Lemme try this one.

This didn't trigger a build, though. :(

[sfan5]

Try now.

[lhofhansl]

This is sooo much better!

Still some stuttering when meshes are build, but instead of over 200ms, the worst I have seen is around 50ms, and most of the time it hovers around 20-30ms.

And absolutely no hanging on shutdown.

This is usable now at large viewing_ranges!

Strange that Windows needs these obscure settings instead of just doing the right thing.

[lhofhansl]

We might even want to backport this to a 5.8.1.

[lhofhansl]

Actually I now notice that the MT actually crashes when you exit a game :(

I did not notice before, because I was exiting to the OS and Windows gave no indication about that. (Maybe that's why there was absolutely no wait upon exit.)

But when I "Exit to Menu" I see that it crashes. Meh.

The in-game performance is still awesome!