RNG list to be implemented

As discussed before, I'd like to implement various RNGs in this package. And temporarily they are listed in the following:

Four from [Random123](https://www.deshawresearch.com/resources_random123.html):
- [x] Threefry
- [x] Philox
- [x] AESNI
- [x] ARS

The [xorshift families](http://xoroshiro.di.unimi.it/):
- [x] xoroshiro128+
- [x] xorshift128+
- [x] xorshift1024*

Six from [SPRNG](http://www.sprng.org/)
- [ ] Combined Multiple Recursive Generator
- [ ] 48 Bit Linear Congruential Generator with Prime Addend
- [ ] 64 Bit Linear Congruential Generator with Prime Addend
- [ ] Modified Lagged Fibonacci Generator
- [ ] Multiplicative Lagged Fibonacci Generator
- [ ] Prime Modulus Linear Congruential Generator

Start by choosing one of the six unchecked SPRNG generators and read its linked SPRNG specification. The issue names no files, tests, entry points, or acceptance criteria, so confirm the package location and expected validation before beginning; completion is not defined beyond implementing the selected generator.

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