Windows version 1903 Performance Fix — Subsistence Steam update #789198

Since Microsoft has been rolling out the new Windows 1903 update, many players have reported significant drops in game performance while playing Subsistence (even on high-end hardware). This patch should fix the performance issues for those affected (not all hardware configurations have experienced the issue). Microsoft may patch the issue, but I didn't want to wait. This is essentially a patched version of Alpha 49. It does include a few small tweaks of the upcoming Alpha 50 release, but the main features of A50 are still a work-in-progress (and thus are disabled in this build). I'm working hard on the new update, so please stay tuned for the release. Cheers, CG * Thanks to modder PredatH0r for help with this fix.