More than 35,000 people are projected to swarm this weekend’s TwitchCon in San Diego, up 75 percent from last year’s TwitchCon in San Francisco. But it won’t just be gamers attending the three-day convention. Jostling among the gaming enthusiasts this year are visual artists, designers and musicians, including Steve Aoki, T-Pain and Darude. What Aoki and other artists have discovered is that Twitch devotees also make great music fans, particularly ...