A7.66 The width to height ratio of the primary monitor;
can be modified by the user to determine the
startup resolution of the video device in either window or fullscreen mode, and the behavior of the video_switch function.
1.333 for 4:3, 1.6 for 16:10 widescreen, or 1.777 for 16:9 widescreen.
If the selected fullscreen video aspect is not supported by the video card, the next-nearest video aspect is used. 4:3 is supported by most video cards.
video_aspect = 1.333; // enforce 4:3 mode
video_mode = 7; // start in 800x600 resolution if available
video_switch, video_mode, video_screen,