Create a stripped down version of the robot struct to represent all robots and break up the update into my_robots and robots.

Has dependent change on client

robot.go

@@ -19,8 +19,26 @@ type Robot struct {
 	LastFired   int        `json:"-"`
 }
 
+// This is the subset of data we send to players about robots
+// that are not theirs.
+type OtherRobot struct {
+	Id       string    `json:"id"`
+	Name     string    `json:"name"`
+	Position v.Point2d `json:"position"`
+	Health   int       `json:"health"`
+}
+
+func (r Robot) GetTruncatedDetails() OtherRobot {
+	return OtherRobot{
+		Id:       r.Id,
+		Name:     r.Name,
+		Position: r.Position,
+		Health:   r.Health,
+	}
+}
+
 type RobotSorter struct {
-	Robots []Robot
+	Robots []OtherRobot
 }
 
 func (s RobotSorter) Len() int {