version 5.1.2
1. Added the trading function of the player GUI interface
2. Added announcement system. Configure in the configuration file announcement.yml, you can customize the switch, period, display time and content of the three announcements: message, bossbar, and title, and support color codes.
3. Added /setlobby and /lobby commands (setting the main city is an administrator command)
4. Added /invsee and /endersee commands (check player backpacks and ender boxes, both are administrator commands)
5. Updated @ sound effect and top reminder
6. Added the API of the mail system
7. Added the API of the sidebar system
8. Greatly optimized the performance of the sidebar system
9. Refactored the code of the mail system
10. Refactored the code of the sidebar system
11. Refactored the chest lock
12. Adjust the data stored in playerlist.yml (the old data can be automatically converted)
13. Added startup characters