Expose Tracked Players

A lot of plugins seem to use reflection to determine this, so this could be a bit of a starter-patch as future PR'ers could also exposed tracked entities as well.

Spigot-API-Patches/0276-Expose-Tracked-Players.patch

@@ -0,0 +1,33 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Tom <cryptite@gmail.com>
+Date: Fri, 26 Feb 2021 16:24:25 -0600
+Subject: [PATCH] Expose Tracked Players
+
+
+diff --git a/src/main/java/org/bukkit/entity/Player.java b/src/main/java/org/bukkit/entity/Player.java
+index 5fe48dcc5a3ea492915350cff44d5f112ce11dbf..b391c720b69714cf49f8733cf4440864ac3dcd72 100644
+--- a/src/main/java/org/bukkit/entity/Player.java
++++ b/src/main/java/org/bukkit/entity/Player.java
+@@ -1,6 +1,7 @@
+ package org.bukkit.entity;
+ 
+ import java.net.InetSocketAddress;
++import java.util.Set; // Paper
+ import java.util.UUID;
+ import com.destroystokyo.paper.ClientOption; // Paper
+ import com.destroystokyo.paper.Title; // Paper
+@@ -1976,6 +1977,14 @@ public interface Player extends HumanEntity, Conversable, OfflinePlayer, PluginM
+     void sendOpLevel(byte level);
+     // Paper end
+ 
++    // Paper start
++    /**
++     * @return Returns a set of Players within this player's tracking range (that the player's client can "see")
++     */
++    @NotNull
++    Set<Player> getTrackedPlayers();
++    // Paper end
++
+     // Spigot start
+     public class Spigot extends Entity.Spigot {
+