Move Event cancellable parts to trait

src/pocketmine/event/player/PlayerItemUseEvent.php

@@ -24,6 +24,7 @@ declare(strict_types=1);
 namespace pocketmine\event\player;
 
 use pocketmine\event\Cancellable;
+use pocketmine\event\CancellableTrait;
 use pocketmine\item\Item;
 use pocketmine\math\Vector3;
 use pocketmine\Player;
@@ -32,6 +33,7 @@ use pocketmine\Player;
  * Called when a player uses its held item, for example when throwing a projectile.
  */
 class PlayerItemUseEvent extends PlayerEvent implements Cancellable{
+	use CancellableTrait;
 
 	/** @var Item */
 	private $item;