Engine: "upscale" overriding config option

The earlier versions of AGS provided support for "upscaling" low-res games (320x200 and 320x240) to hi-res (640x400 and 640x480 respectively).
The script API has means for detecting if the game is running upscaled, and game developer could use this opportunity to setup game accordingly (e.g. assign hi-res fonts, etc).
This feature is officially deprecated since 3.1.0, however the engine itself still supports it, technically.
This overriding option re-enables "upscaling". It works ONLY for low-res resolutions, such as 320x200 and 320x240.