Added setArmorContents as a method for PlayerInventory.

By: Raphfrk <raphfrk@gmail.com>

paper-api/src/main/java/org/bukkit/inventory/PlayerInventory.java

@@ -39,6 +39,13 @@ public interface PlayerInventory extends Inventory {
      */
     public ItemStack getBoots();
 
+    /**
+     * Put the given ItemStacks into the armor slots
+     *
+     *  @param items The ItemStacks to use as armour
+     */
+    public void setArmorContents(ItemStack[] items);
+
     /**
      * Put the given ItemStack into the helmet slot
      * This does not check if the ItemStack is a helmet