State prosecutors have charged a former USA Climbing coach who lives in Summit County with 13 felonies for allegedly possessing and distributing sexually explicit videos involving children. Court documents indicate Matthew Maddison, 37, was charged last week with 10 counts of sexual exploitation of a minor, a second-degree felony, and three counts of aggravated sexual exploitation of a minor, a first-degree felony. Maddison is being held without…