Object representing a range of numbers.
make System.math.range(from, to): Construct new range object.make System.math.range(from, to, step): Construct new range object.current: Current value in range.fromnumber: The beginning of the given range.step: The amount to skip between numbers in the range.tonumber: The end of the given range.cur(): Returns the current number in the range.next(): Moves pointer to next object in range.reset(): Resets range to the beginning.