Send area broadcasted packets in batches

- I don't know why it wasn't done like this to start with
- This provides a significant lightening of workload for large servers with lots of players in the same area because packets are only compressed once instead of for each player.
- Improves client-sided performance receiving these in batches instead of being spammed with many individual packets.

src/pocketmine/level/Level.php

@@ -786,9 +786,7 @@ class Level implements ChunkManager, Metadatable{
 			Level::getXZ($index, $chunkX, $chunkZ);
 			$chunkPlayers = $this->getChunkPlayers($chunkX, $chunkZ);
 			if(count($chunkPlayers) > 0){
-				foreach($entries as $pk){
-					$this->server->broadcastPacket($chunkPlayers, $pk);
-				}
+				$this->server->batchPackets($chunkPlayers, $entries, false, false);
 			}
 		}