Fixed issue when vanish command used in 1.20.1 gives an eror

In this update, we've added a new vanish feature to Hider Plus to enhance player privacy and integrate seamlessly with the join/leave message system:

• Added the /vanish command to hide players from others and remove them from the tablist.
• The vanish feature works with the join/leave message toggle. If join/leave messages are disabled, no messages will show when vanishing. If enabled, the messages will display.

These improvements make the plugin more versatile and useful for server administrators and content creators.

In this update, we have streamlined Hider Plus by removing certain features to focus on core functionality. Specifically:

• Removed the tablist feature.
• Removed the /hidemessages command.

These changes aim to improve the plugin's performance and simplicity, making it more efficient and easier to use.

Update 1.1: Enhanced Privacy Features and Multi-Version Support

• Added toggleable join/leave message hiding with /hidejoinleave.
• Improved name tag hiding with tab list removal using /hidetag.
• Introduced command to mute messages with /hidemessages.
• Ensured compatibility with Minecraft versions 1.20, 1.20.6, and 1.21.
• Various bug fixes and improvements.