[atv2] - support for ios6

Well i have commented everything important in the code. I have tested this on all ios versions which are jailbreakable untethered (atv2 versions 4.2.1, 4.3, 4.4.4, 5.0.2, 5.2).

I just do it as a pr for easier backporting to Frodo 12.1 (i want to keep these commits seperated for the history).

Also i'm going to push a Frodo 12.0 backport branch called "Frodo-ATV2-iOS6" same we did for eden. I will tag it and build it and we will add it to cydia as 12.0-1. I hope this will keep the support hazzle down (at least that worked for Eden).

We really should consider changing our major release date - it seems we always release a couple of weeks before apple bumps major ios version on atv2 and so breaks us the neck *haha*.