Add some expansions to Anvil Inventory API

By: Xor Boole <mcyoung@mit.edu>

paper-server/src/main/java/org/bukkit/craftbukkit/inventory/CraftInventoryAnvil.java

@@ -1,19 +1,22 @@
 package org.bukkit.craftbukkit.inventory;
 
+import net.minecraft.server.ContainerAnvil;
 import net.minecraft.server.IInventory;
 import org.bukkit.Location;
-
 import org.bukkit.inventory.AnvilInventory;
 import org.bukkit.inventory.ItemStack;
 
 public class CraftInventoryAnvil extends CraftInventory implements AnvilInventory {
+
     private final Location location;
     private final IInventory resultInventory;
+    private final ContainerAnvil container;
 
-    public CraftInventoryAnvil(Location location, IInventory inventory, IInventory resultInventory) {
+    public CraftInventoryAnvil(Location location, IInventory inventory, IInventory resultInventory, ContainerAnvil container) {
         super(inventory);
         this.location = location;
         this.resultInventory = resultInventory;
+        this.container = container;
     }
 
     public IInventory getResultInventory() {
@@ -53,4 +56,19 @@ public class CraftInventoryAnvil extends CraftInventory implements AnvilInventor
     public Location getLocation() {
         return location;
     }
+
+    @Override
+    public String getRenameText() {
+        return container.l; // PAIL: renameText
+    }
+
+    @Override
+    public int getRepairCost() {
+        return container.a; // PAIL: levelCost
+    }
+
+    @Override
+    public void setRepairCost(int i) {
+        container.a = i; // PAIL:levelCost
+    }
 }