Fixes to Codex plugin code
Configuration files

• config.yml: Updated to match the content provided (teleport delays, headdb, menu, areas with itemsadder).
• messages.yml: Updated to match the content provided (messages in French, removing obsolete messages for delete and no_selection).

Java code changes
CodexZone.java

• Added itemsadder field to read the value from the config.
• Changed getIcon() to prioritize ItemsAdder > HeadDatabase > Material by default.

HeadUtil.java
Added support for the "itemsadder:" prefix in getHead().

• Added internal class IAHelper to manage ItemsAdder items via dev.lone.itemsadder.api.CustomStack.

ZoneManager.java

• The attached file shows the saveZone() method which sets default values, including skull: "headdb:1234", but not itemsadder. If necessary, add sec.set("itemsadder", null); for consistency.