Handheld gaming company Abxylute is planning to launch a new game controller for smartphones. But instead of an expandable accessory that lets you position a phone between left and right sides of the controller, this is a magnetic accessory that snaps onto the back of a phone and and slides out when you need it. What's particularly interesting is that when your phone is in landscape orientation and you slide out the controller, it's positioned below the screen giving you a sort of T-shaped apparatus that reminds me of the discontinued…