v2.5.6

1.Fixed incorrect driver value in GET /dlog/statistics/chart
2.Fixed email connection validation
3.Fixed specific configs are not reloaded after config reload
4.Added support to multiple embeds for automatic embeds
5.Merged member_welcome into member_accept
6.Added embed validator to prevent 500 errors due to invalid embed config
7.Added config.driver_role_add/remove
8.Added config.roles[].order_id
Hint The order of roles no longer relies on role_id