Async updates, help command, command message on tier change and fixes
ADDED
<MESSAGE> in tier-change commands : Placed at the beginning of the line, the content will be sent directly to the player.
/karma help command : With custom text inside lang files, can be used to send list of command to the sender. players need karma.help permission, granted by default.
On edit command (/karma add / remove / set), if the value isn't a number, a custom (lang file) message will be sent to sender.
CHANGES
Updates into players file and database are now asyncronous to improve performances.
FIXES
Hitting a CustomNPC NPC without Karma metadata set changes player karma even if the NPC is unvulnerable.