Regency Entertainment, the primary financier of Warren Beatty’s Rules Don’t Apply, is suing the fillmmaker for breach of contract, claiming he and others have not repaid the P&A losses the company says he was obligated to do per their contract after the movie failed to connect at the box office last year. The suit (read it here), filed today in Los Angeles Superior Court, seeks at least $18 million in damages from a company, Tatira 2, set up by Beatty to make the film, as…