Fixed Point Sqrt block

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As the name suggests, we should probably implement Sqrt for #27 to be doable. Newton–Raphson's method is a good place to start, and we could also likely implement this with an LUT coupled with a couple Newton-Raphson rounds.

This paper Also gives a good overview on using a Cartesian Genetic Algorithm to generate circuits that perform well in comparison to common existing methods. We likely won't do something like this, but it provides a good overview of how some of the other more standard methods perform in comparison.

[jjm469]

https://en.wikipedia.org/wiki/Fast_inverse_square_root