[chatplus] Unlock the chatcommand callbacks by tweaking the api
[chatplus] Unlock the chatcommand callbacks by tweaking the api

- For MinetestForFun/server-minetestforfun#343

MinetestForFun/server-minetestforfun-creative,MinetestForFun/server-minetestforfun-creative,MinetestForFun/server-minetestforfun-creative