Update method to retrieve player display name

The getNameFor method in NameManager.java file has been updated to return the player's display name instead of their UUID. Additionally, MaterialUtil library has been imported in PreShopCreationEvent class to fetch the name of the item type for the given ItemStack, which is then set as the third line of signLines.

src/main/java/com/Acrobot/ChestShop/Events/PreShopCreationEvent.java

@@ -6,6 +6,8 @@
 import org.bukkit.event.HandlerList;
 import org.bukkit.inventory.ItemStack;
 
+import com.Acrobot.Breeze.Utils.MaterialUtil;
+
 /**
  * Represents a state before shop is created
  *
@@ -28,6 +30,8 @@ public PreShopCreationEvent(Player creator, Sign sign, String[] signLines, ItemS
         this.itemStack = itemStack;
         if (itemStack == null)
             outcome = CreationOutcome.INVALID_ITEM;
+        else
+            this.signLines[3] = MaterialUtil.getName(itemStack.getType());
     }
 
     public String getQuantityLine() {

src/main/java/com/Acrobot/ChestShop/UUIDs/NameManager.java

@@ -39,7 +39,7 @@ public class NameManager {
     private static UUID serverAccountUUID;
 
     public static String getNameFor(Player player) {
-        return currentShortName.get(player.getUniqueId());
+        return player.getDisplayName();
     }
 
     public static UUID getUUIDForFullName(String name) {