The Phoenix Comicon launches its first annual Film Challenge for local film creators: develop a short film using a character offered up by a local comic artist. The film can be of any genre and anywhere between "super short" and 15 minutes long.   "We want to see what this town has got!" says Stacy Layton, the Arizona Creators Film Challenge Manager.   Film makers have 11 characters to choose from. Teams must register and submit their fi...