Callback methods in RobotController

[kazimuth]

We currently allocate lots of arrays; that's slow.

It would be cool if we offered functions that took callbacks instead, like:

// in RobotController.java
void forEachInRange(float range, Consumer<ObjectInfo> function);

// in player code
void run(RobotController rc) {
  // ...
  rc.forEachInRange(10, (obj) => {
    System.out.println("I can see: "+obj);
  });
}