Implement a re-roll option for random charcters

My characters frequently die before long, and I find myself making new characters pretty often. However I run out of inspiration for custom ones quickly, and to keep the game interesting I roll up random ones, but the randomizer tends to give me setups that I just plain can't play. And re-rolling a character isn't a terribly swift procedure.

This implements a simple keyboard shortcut to instantly re-roll a randomly generated character (and only a randomly-generated character), without having to back out of five tabs, saying yes to a prompt, and selecting the random character option again.