Chunk: move protocol-specific getSubChunkSendCount() to network chunk serializer

src/world/format/Chunk.php

@@ -682,22 +682,6 @@ class Chunk{
 		return $this->subChunks;
 	}
 
-	/**
-	 * Returns the count of subchunks that need sending to players
-	 *
-	 * @return int
-	 */
-	public function getSubChunkSendCount() : int{
-		for($count = $this->subChunks->count(); $count > 0; --$count){
-			if($this->subChunks[$count - 1]->isEmptyFast()){
-				continue;
-			}
-			break;
-		}
-
-		return $count;
-	}
-
 	/**
 	 * Disposes of empty subchunks and frees data where possible
 	 */