Convert Populator into an interface

src/world/generator/populator/GroundCover.php

@@ -32,7 +32,7 @@ use pocketmine\world\ChunkManager;
 use function count;
 use function min;
 
-class GroundCover extends Populator{
+class GroundCover implements Populator{
 
 	public function populate(ChunkManager $world, int $chunkX, int $chunkZ, Random $random) : void{
 		$chunk = $world->getChunk($chunkX, $chunkZ);

src/world/generator/populator/Ore.php

@@ -28,7 +28,7 @@ use pocketmine\world\ChunkManager;
 use pocketmine\world\generator\object\Ore as ObjectOre;
 use pocketmine\world\generator\object\OreType;
 
-class Ore extends Populator{
+class Ore implements Populator{
 	/** @var OreType[] */
 	private $oreTypes = [];
 

src/world/generator/populator/Populator.php

@@ -24,12 +24,13 @@ declare(strict_types=1);
 /**
  * All the Object populator classes
  */
+
 namespace pocketmine\world\generator\populator;
 
 use pocketmine\utils\Random;
 use pocketmine\world\ChunkManager;
 
-abstract class Populator{
+interface Populator{
 
-	abstract public function populate(ChunkManager $world, int $chunkX, int $chunkZ, Random $random) : void;
+	public function populate(ChunkManager $world, int $chunkX, int $chunkZ, Random $random) : void;
 }

src/world/generator/populator/TallGrass.php

@@ -28,7 +28,7 @@ use pocketmine\block\VanillaBlocks;
 use pocketmine\utils\Random;
 use pocketmine\world\ChunkManager;
 
-class TallGrass extends Populator{
+class TallGrass implements Populator{
 	/** @var int */
 	private $randomAmount = 1;
 	/** @var int */

src/world/generator/populator/Tree.php

@@ -29,7 +29,7 @@ use pocketmine\utils\Random;
 use pocketmine\world\ChunkManager;
 use pocketmine\world\generator\object\TreeFactory;
 
-class Tree extends Populator{
+class Tree implements Populator{
 	/** @var int */
 	private $randomAmount = 1;
 	/** @var int */