Perhaps no company in the video game industry is as prescient as Valve. The Half-Life 2 developer foresaw the coming importance of digital distribution in 2003, fighting against market forces to launch its Steam platform. Now, more than a decade later, it sees another major change on the horizon that will change the way we play games: virtual reality. Valves Michael Abrash — a programming veteran who helped create Windows NT and co-authored Quake with John Carmack — spoke about the technology at the recent Steam Dev Days conference. …