Waiting for input on Windows uses high CPU

[cdgriffith]

When using a simple cutie.select on Windows, a CPU core will be pegged to 80~90% while waiting for input due to readchar.

I tried switching to using this method with msvcrt.getch() and it seemed to use near 2% CPU usage while waiting for character input for comparison.

(In the screenshot the CPU has hyperthreading so even though 2 are pegged it's just a single core.)

Edit: I am going to open an issue on readchar, because it's a really easy fix of a while loop gone astray. magmax/python-readchar#42