Fixed some Grammar issues related to the message stating you don't have permission.
Added gamemode commands: /gamemode creative, /gamemode survival, /gamemode adventure and /gamemode spectator. All featuring well known aliases such as instead of Creative, you can just use C or 1. Instead of Gamemode you can just use GM.
Added an /invsee command which will allow you to open the targeted players inventory and even move items out, around or in!
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