Changed positive and negative values to public static finals, allowing them to be used outside the Helper class.
Progress on localisation. Still very buggy / messy.
Added more commands to default command environment.
Progress with localisation
Added localisation as a private variable, as well as getter and setter methods. Moved some method down to improve readability.
Now working for simple functionality. Still needs work on setting the status of other players or in other worlds (noted with TODO). Added positive and negative values to aliases so, for example, /pvp true, /pvp yes, /pvp no, and /pvp off, all work.