Tonight is opening night for another Chicago’s Porchlight Music Theatre season. But it’s not just any opening.It marks the beginning of the 25th anniversary season of this most ambitious musical theater company, nationally recognized for bringing classic productions and new works as well as showcasing veteran local performers and emerging future stars to Chicago audiences.It has previously won 42 Jeff Awards and this year has been nominated for 17 more, the most of any local theater.For this season, Director …