Faster operations needed

[JASory]

Number-Theory's end goal is to be among the pre-eminent elementary number theory libraries of any language

While it is quite fast for machine-sized words (possibly the fastest in any language). It slacks in arbitrary precision arithmetic, with exponentiation in particular being about 60% slower than num-bigint.

In order of priority

1. Faster exponentiation. Look into preallocation.
2. Specialized Squaring operation
3. Faster euclidean division, possibly recursive division
4. Fast base-2 strong Fermat check
5. Faster factorization needed, either in the form of elliptic curve factorization and/or quadratic sieve. Eventually the GNFS is planned to be implemented.
6. Schonhage-Strassen multiplication using Fermat Transforms