Implementation of pRNG algorithms within UME::SIMD

[Guilherme Amadio]

It would be nice to have at least a simple (and thread-safe, if possible) random number generator in UME::SIMD. Even a linear congruential generator should be good enough for some applications, and ideally a generator with good randomness for more sensitive workloads (e.g., particle simulation).

The links below might be helpful:

• https://arxiv.org/pdf/1003.1898.pdf
• http://www.phy.duke.edu/~rgb/General/dieharder.php
• https://www.gnu.org/software/gsl/manual/html_node/Random-number-generator-algorithms.html#Random-number-generator-algorithms