Add hasOwner method to item super class

src/games/stendhal/server/entity/item/Item.java

@@ -561,6 +561,16 @@ public void autobind(String player) {
 		}
 	}
 
+	/**
+	 * Checks if an item is marked as "owned" by a specific player.
+	 *
+	 * @return
+	 *   Always {@code false} in this implementation.
+	 */
+	public boolean hasOwner() {
+		return false;
+	}
+
 	/**
 	 * Get the item's itemData. The itemData contains context specific
 	 * information that is used by the implementation.

src/games/stendhal/server/entity/item/OwnedItem.java

@@ -1,5 +1,5 @@
 /***************************************************************************
- *                     Copyright © 2020 - Arianne                          *
+ *                 Copyright © 2020-2024 - Faiumoni e. V.                  *
  ***************************************************************************
  ***************************************************************************
  *                                                                         *
@@ -21,6 +21,9 @@
 
 /**
  * Class representing an item owned by an entity.
+ *
+ * An "owned" item is different than a bound item in that it can be used by players other than the
+ * owner but they do not get the same or full benefit of.
  */
 public abstract class OwnedItem extends Item {
 
@@ -82,8 +85,9 @@ public boolean onUsed(final RPEntity user) {
 	 * Override to check if item has owner.
 	 *
 	 * @return
-	 * 		<code>true</code> if owned.
+	 *   {@ true} if owned.
 	 */
+	@Override
 	public boolean hasOwner() {
 		return getOwner() != null;
 	}