Add World.getPlayerCount

Spigot-API-Patches/Provide-E-TE-Chunk-count-stat-methods.patch

@@ -7,7 +7,7 @@ Provides counts without the ineffeciency of using .getEntities().size()
 which creates copy of the collections.
 
 diff --git a/src/main/java/org/bukkit/World.java b/src/main/java/org/bukkit/World.java
-index 56f50296..2b6136fd 100644
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
 --- a/src/main/java/org/bukkit/World.java
 +++ b/src/main/java/org/bukkit/World.java
 @@ -0,0 +0,0 @@ import org.bukkit.util.Vector;
@@ -34,6 +34,11 @@ index 56f50296..2b6136fd 100644
 +     * @return The amount of Chunks in this world
 +     */
 +    int getChunkCount();
++
++    /**
++     * @return The amount of Players in this world
++     */
++    int getPlayerCount();
 +    // Paper end
 +
      /**