Add shoot() and readyShooter() to Auton
Remove Shooter.reset() action; remove !retracting condition from Shooter.fireBall()
Make significant 2-shot auton changes

Combine startLoadingNextBall() and finishLoadingNextBall() into
loadNextBall(). Ensure minimal delay in CV/analog 2-shot autons; ensure
appropriate delay in dumb 2-shot for 50/50 chance of hot score.