RequiredArg

This class is used for creating the Command class, it has 2 main uses: throw an error if the defined argument is not given and show the argument when using &help

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Constructor:

1. argnum (number): this is the argument number this class needs to check, 0 would be the first argument, 1 the second and so on
2. errormsg (string): this string that the bot will send if the required argument
3. name (string): this string that rappresents the name of the argument, will appear when using &help with the command
4. notrequired (boolean): if true, the check will be skipped when called, and this class will only be used to display the class name when using &help

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Methods:

• check (array args): will check if args has a value in the position this.argnum