Follow-ups to Gift Wrapping Coding Challenge

- [x] Gift Wrapping Algorithm
- [ ] Generator Functions. They help animating algorithms, you don't have to worry about removing all the `for` loops and `while` loops, and replacing them with the `draw` loop. This is because the `next()` function allows the code to stop at a given point (marked with `yield`) every time through `draw`.
- [ ] Gift Wrapping with Generator Functions
- [ ] Graham Scan, a Faster Convex Hull Algorithm
- [ ] Chan's Algorithm, an Even Faster Convex Hull Algorithm