Murphy Funkhouser Capps begins writing her plays by living her life. That’s why it’s impossible to separate the writer and performer from the teenage runaway, the former solo parent, the woman whose husband is battling bone cancer. Funkhouser Capps’ new autobiographical show, “Carry On,” is an expansion of her first solo show, “Crazy Bag,” which premiered eight years ago. In both, Funkhouser Capps uses luggage as a metaphor for stuffing away life’s accumulated baggage, unpacking and facing it or