New Year cards + Info on PlayerShops/HiredMerchants

New Year is coming soon! Figured out implementation for the New Year cards. Opcodes and packet structures are thanks to Eric.
New Year effect crashes/dc's the player in some cases.
Added informative notes to shop owners when transactioning an item/bundle.

src/constants/ItemConstants.java

@@ -89,6 +89,14 @@ public final class ItemConstants {
         return itemId / 1000 == 5000;
     }
     
+    public static boolean isNewYearCardEtc(int itemId) { 
+        return itemId / 10000 == 430;
+    } 
+     
+    public static boolean isNewYearCardUse(int itemId) { 
+        return itemId / 10000 == 216;
+    }
+    
     public static boolean isAccessory(int itemId) {
         return itemId >= 1110000 && itemId < 1140000;
     }