[Module] add algorithm module

[khchen]

1. Add built-in string comparing.
2. Add algorithm module, include sort, isSorted, binarySearch, reverse.
3. Wrap these functions to methods of List.

Example:

print([4, 5, 1, 3, 2].sort())
print([4, 5, 1, 3, 2].sort().isSorted())
print([4, 5, 1, 3, 2].sort().binarySearch(4))
print([4, 5, 1, 3, 2].reverse())

from math import sqrt

class Point
  def _init(x, y)
    self.x = x; self.y = y
  end

  def _str
    return "(${self.x}, ${self.y})"
  end
end

l = [Point(3, 4), Point(1, 3), Point(2, 5)]
l.sort fn(p1, p2)
  return sqrt(p1.x**2 + p1.y**2) - sqrt(p2.x**2 + p2.y**2)
end
print(l[0], l[1], l[2])

Output:

[1, 2, 3, 4, 5]
true
3
[2, 3, 1, 5, 4]
(1, 3) (3, 4) (2, 5)