Added Steam Overlay load prevention + DayZ settings files

Initial support for DayZ Standalone with working Borderless mode and post-processing effects. Only works with Alternate Injection Method.

For some weird reasons Steam in-game overlay caused DayZ to crash when GeDoSaTo was enabled and overlay disabled in Steam settings, so this patch also includes an option for preventing GameOverlayRenderer.dll to load which effectively disables the overlay completely.