The movie-riffing bosses of the annual Game Developers Conference have declared their intent to put thousands of square feet of in-game terrain beneath the greyness of their glamorous panels and a glistening stream of a spectator's ambition-bar off-ramp. Last year it was everything but our arthritic tread and fearful thinning hair: a massive 600-acre snow planet in southern Quebec for gamers to play on and complain about the lack of sales, or glancing around at the millions who