Have you seen &amp;#8220;Sweeney Todd&amp;#8221;?&nbsp; Have you seen it under the stars? Musicals at Richter, now in its 27th season as the longest-running outdoor theater in Connecticut, will stage &ldquo;Sweeney Todd,&amp;#8221;&nbsp;Stephen Sondheim&rsquo;s Tony-winning musical thriller about love, obsession, revenge and a uniquely satisfying recipe for meat pies. It plays Thursday, July 7 through Saturday, July [...]