Tamagotchis never really carried any guilt, did they? You could let them die, and just hit reset. No biggie, right? iHobo is about to make you feel like utter crap for all the virtual pets you never saved, and then some. iHobo (yes, that’s its real name) is a free charity iPhone app that leaves you in charge of a virtual homeless person, but believe it or not, the app is not in bad taste – rather, it’s meant to call attention to the issue of homelessness at large. Well, actually, in the UK specifically, but the message is universal. iHobo takes up residence in your iPhone for three days, and it’s up to you to…