Extract Fallable into trait + interface

Traits are inferior to components in pretty much every aspect imaginable :(

src/pocketmine/block/utils/FallableTrait.php

@@ -0,0 +1,63 @@
+<?php
+
+/*
+ *
+ *  ____            _        _   __  __ _                  __  __ ____
+ * |  _ \ ___   ___| | _____| |_|  \/  (_)_ __   ___      |  \/  |  _ \
+ * | |_) / _ \ / __| |/ / _ \ __| |\/| | | '_ \ / _ \_____| |\/| | |_) |
+ * |  __/ (_) | (__|   <  __/ |_| |  | | | | | |  __/_____| |  | |  __/
+ * |_|   \___/ \___|_|\_\___|\__|_|  |_|_|_| |_|\___|     |_|  |_|_|
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * @author PocketMine Team
+ * @link http://www.pocketmine.net/
+ *
+ *
+*/
+
+declare(strict_types=1);
+
+namespace pocketmine\block\utils;
+
+use pocketmine\block\Block;
+use pocketmine\block\BlockFactory;
+use pocketmine\block\Fire;
+use pocketmine\block\Liquid;
+use pocketmine\entity\EntityFactory;
+use pocketmine\entity\object\FallingBlock;
+use pocketmine\level\Position;
+use pocketmine\math\Facing;
+
+/**
+ * This trait handles falling behaviour for blocks that need them.
+ * TODO: convert this into a dynamic component
+ * @see Fallable
+ */
+trait FallableTrait{
+
+	abstract protected function asPosition() : Position;
+
+	abstract protected function getId() : int;
+
+	abstract protected function getDamage() : int;
+
+	public function onNearbyBlockChange() : void{
+		$pos = $this->asPosition();
+		$down = $pos->level->getBlock($pos->getSide(Facing::DOWN));
+		if($down->getId() === Block::AIR or $down instanceof Liquid or $down instanceof Fire){
+			$pos->level->setBlock($pos, BlockFactory::get(Block::AIR));
+
+			$nbt = EntityFactory::createBaseNBT($pos->add(0.5, 0, 0.5));
+			$nbt->setInt("TileID", $this->getId());
+			$nbt->setByte("Data", $this->getDamage());
+
+			/** @var FallingBlock $fall */
+			$fall = EntityFactory::create(FallingBlock::class, $pos->getLevel(), $nbt);
+			$fall->spawnToAll();
+		}
+	}
+}