Those of us who have TiVo boxes have seen, many a time, the colorful little bit of animation when the TiVo first starts up or reboots. The TiVo mascot — who looks a lot like us after we've been watching TV all night — dances and prances about a little world of circuitry and design. On the new TiVo boxes for HD, there's a new bit of animation and it looks like this…