Use distance map to optimise entity tracker / Misc Utils

Use the distance map to find candidate players for tracking.

This also ports a few utility changes from Tuinity

Spigot-Server-Patches/Increase-Light-Queue-Size.patch

@@ -14,12 +14,12 @@ light engine on shutdown...
 The queue size only puts a cap on max loss, doesn't solve that problem.
 
 diff --git a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
-index 659a011e97..88a45e517c 100644
+index 803be76772..3c0468bc44 100644
 --- a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
 +++ b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
 @@ -0,0 +0,0 @@ public class PaperWorldConfig {
-     private void trackerUpdateDistance() {
-         trackerUpdateDistance = getDouble("tracker-update-distance", trackerUpdateDistance);
+     private void zombieVillagerInfectionChance() {
+         zombieVillagerInfectionChance = getDouble("zombie-villager-infection-chance", zombieVillagerInfectionChance);
      }
 +
 +    public int lightQueueSize = 20;