Permuted Mwc random number generator

It is a member of the PCG family but uses an MWC generator instead of an LCG. This an MWC is special form of a MCG generator similar to the PGC-64-fast variant.

Compared to PGC-64-fast, Mwc256XXA64 is both faster and produces higher quality rand numbers (due to using the full 256bit state as opposed to only half of it.)

For a detailed description of the design, see: https://tom-kaitchuck.medium.com/designing-a-new-prng-1c4ffd27124d

Mwc256XXA64

A fast high quality PRNG with 64bits of output, and a 256bit state. This is faster on 64bit architectures.

Mwc128XXA32

A fast high quality PRNG with 32bits of output, and a 128bit state. This is faster on 32bit architectures.