Legal play to win, iteration of games, winning rates

Cool new additions, guys! A whole game of Scheisskopf is now computer
agent-playable. We can also run a bunch of trials and record win rates
for agents. Pitting a random agent against a naive reflex agent seems
hopeful; reflex agent wins almost all of the time (about 90%). However,
playing against a random agent occasionally produces a game that
doesn’t terminate. I’m inclined (from experience) to think that this
occurs in the endgame. We should determine if it’s possible to break
this loop. There’s still a couple of basic architectural things that I
need to go back and clean up, but I’ll get to these soon. Let’s work
that GUI!