Wandering Merchants

The changes in this version includes:

• Added /wm command. Read the README for its usage guide
• Updated config and added a new no_permission_message
• Wandering Merchants now supports all Minecraft versions between 26.3 and 1.21.9
• An update alert is sent to server operators on join when there is a new update
• Dropped support for the old format that was used in version 1.1.3 and before. The /wm command allows you to manually migrate them to the newest format due to the amount of functionality it provides

If you are updating from version 1.1.3, please update to 1.1.5 first to migrate the merchant NPC system and the merchant items then update to version 1.1.6