>Fix a bug that player can use offhand horn but doesnt consume it in 1.12.2
>Add @at new function. Usage: "@player_name " Attention the [space]
>Add empty prefix function. When you set ChatPrefix: "" , whatever player say will be transfered to serverchat .
>Rewrite lang class ! now you can add your own lang file !
>Add support of Vault ! Point support will be add in the future
>Now you can set cost-prefix-chat
>Now player can buy item by command