Metadata for command arguments

[NanderTGA]

Command gets a new property: arguments
Example:

client.commands.dice = {
    arguments: [
        {   // turns into <sides>
            name: "sides",
            required: true,
        }, {
            // turns into [...stuff]
            name: "stuff",
            required: false,
            rest: true,
        }
    ]
}

I also have this idea to do some validation perhaps. (Sending a user things like missing command error...).

[NanderTGA]

Wait we should also do overloads for better clarity.
How about we also allow this:

client.commands.random = {
    arguments: [
        [
            {
                name    : "maximum",
                required: true,
            },
        ],
        [
            {
                name    : "minimum",
                required: true,
            }, {
                name    : "maximum",
                required: true,
            },
        ],
    ],
};

Which would turn into this in the help command:

!random <maximum>
!random <minimum> <maximum>