Songwriter Peter Allen, collaborating with Carole Bayer Sager, once wrote a song called “Everything Old Is New Again.” That sentiment is still true today.Well, maybe not everything. But I think it applies to the refurbished Studebaker Theater and its current musical production of “Personality,” playing through July 30 at 410 S. Michigan Avenue.It’s based on the life and times of Lloyd Price, a Black musician who many consider to have started the rhythm and blues era when he was a 19-year-old …