Added a message, which is output on join, which says: &7To accept an invitation, use the command &5/clan join&7. To decline an invitation, use &5/clan decline&7.
Fixed issue #3
Fixed that it was output that the player is not in the clan even when he was in the clan, but not when he was not in the clan
FIxed issue #5
Renamed identifier Create.NameToLong to General.NameTooLong and General.TagToLong to General.TagTooLong