[Reign of Kings] Oxide permissions fix
[Reign of Kings] Oxide permissions fix

Fixed the permission commands oxide.grant, oxide.revoke and oxide.usergroup.
Added feedback when the player does not have permission to use the command.

MSylvia/Oxide,LaserHydra/Oxide,Nogrod/Oxide-2,Visagalis/Oxide,Visagalis/Oxide,Nogrod/Oxide-2,LaserHydra/Oxide,bawNg/Oxide,bawNg/Oxide,MSylvia/Oxide