1.7.20 Anti-Surfer gun fix

I know you can't really say anything from 1 battle, but I don't ever recall seeing a score vs Shadow like this one. =) Yay!

My Anti-Surfer gun tries to predict the enemy's surfing on the nearest wave, then restrict its min/max firing angles to those still reachable assuming the enemy surfed the nearest wave as expected. For figuring out what's reachable, I hacked up my precise MEA calculation with a different starting state. But basically I screwed that all up and it hardly worked at all. (About time I started writing unit tests...)

Despite being broken, I had tested this gun against all my worst matchups and it helped against Shadow. So hopefully it will work better now.