Added Loom blocks

these don't support doing patterns yet, but their inventories work.

src/block/Loom.php

@@ -0,0 +1,57 @@
+<?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;
+
+use pocketmine\block\inventory\LoomInventory;
+use pocketmine\block\utils\BlockDataSerializer;
+use pocketmine\block\utils\FacesOppositePlacingPlayerTrait;
+use pocketmine\block\utils\HorizontalFacingTrait;
+use pocketmine\item\Item;
+use pocketmine\math\Vector3;
+use pocketmine\player\Player;
+
+final class Loom extends Opaque{
+	use FacesOppositePlacingPlayerTrait;
+	use HorizontalFacingTrait;
+
+	public function readStateFromData(int $id, int $stateMeta) : void{
+		$this->facing = BlockDataSerializer::readLegacyHorizontalFacing($stateMeta & 0x3);
+	}
+
+	protected function writeStateToMeta() : int{
+		return BlockDataSerializer::writeLegacyHorizontalFacing($this->facing);
+	}
+
+	public function getStateBitmask() : int{
+		return 0b11;
+	}
+
+	public function onInteract(Item $item, int $face, Vector3 $clickVector, ?Player $player = null) : bool{
+		if($player !== null){
+			$player->setCurrentWindow(new LoomInventory($this->pos));
+			return true;
+		}
+		return false;
+	}
+}