%filterActionWords()

    Takes a string or array parameter. If the parameter is a string then a
    string will be returned with filler (non-action) words removed. If the
    parameter is an array then an array will be returned with the filler word
    values removed and re-indexed from 1 onward. The following are considered
    filler words:

        a, an, in, into, from, with,
        within, the, on, onto, at, to

    Example:

        @input = "put the apple in the bucket"
        @input = %filterActionWords( @input )

        echo Action Input: @input

    Output:

        Action Input: put apple bucket


    Example:

        @input = "put the apple in the bucket"
        @input = %stringToWords( @input )
        @input = %filterActionWords( @input )

        foreach( @input as @key => @value )
        {
            echo Key: @key, Value: @value
        }
        endforeach

    Output:

        Key: 1, Value: put
        Key: 2, Value: apple
        Key: 3, Value: bucket