Kai

Results 2 issues of Kai

The method [getClientServerGroups](https://github.com/TheHolyWaffle/TeamSpeak-3-Java-API/blob/master/src/main/java/com/github/theholywaffle/teamspeak3/api/event/ClientJoinEvent.java#L101) in ClientJoinEvent returns a commaseperated String instead of an int-array. This is not really a bug but not in line with other situations like in the [Client](https://github.com/TheHolyWaffle/TeamSpeak-3-Java-API/blob/master/src/main/java/com/github/theholywaffle/teamspeak3/api/wrapper/Client.java#L133)....

i can't test it but the most parts are from the bukkit api and im not exactly sure if its correct to write it in the main-nbt tree (root->hideFlags) because...