Prevent robots from crowding the ball on defense
Prevent robots from crowding the ball on defense

This filters out threats close to the ball when a robot is clearing.
Fixes #877

RoboJackets/robocup-software,JNeiger/robocup-software,JNeiger/robocup-software,JNeiger/robocup-software,RoboJackets/robocup-software,JNeiger/robocup-software,JNeiger/robocup-software,RoboJackets/robocup-software,RoboJackets/robocup-software