The Hitman game series has proven popular enough to spawn a number of sequels, as well as a feature film. And with the release of Hitman GO ($5), it’s clear Square Enix thinks the franchise still has legs, as Agent 47 makes a big move from stealth action/adventure to stealth strategy. It’s important for gamers to think of Hitman GO as a spinoff, rather than a proper continuation of the franchise. Perhaps Agent 47 will become the next…