- Removed Window allocation in `init()`.
- Changed `max_width` and `max_height` to `width` and `height` in `Config`.
- Removed `x_pixel` and `y_pixel` from `Config`.
- Changed the `win` parameter of `toWin()` to Type `Window`.
- Fixed a typo in `fill()` so that it's no longer a recursion trap.
- Updated the example w/ corresponding fixes.