Ghost Recon Online, the free-to-play shooter from Ubisoft Singapore, is coming to Steam in April following a rename — the game is now being called “Ghost Recon Phantoms,” Ubisoft announced on their blog today (http://blog.ubi.com/ghost-recon-phantoms-release-date/). Forgot Ghost Recon Online existed? You could be forgiven for that frankly grievous oversight.…