Update random number generator to use C++11 standard library

[hoytak]

Currently, our random number generator uses boost random library, which has largely been supplanted by C++11. This PR updates the random number tools to use the C++11 intrinsics.

This change is needed to allow us to transition to C++17. In c++17, std::random_shuffle is removed in place of std::shuffle, which is no longer compatible with the boost random generators. This requires us to change the base random generators to the c++11 versions, and thus swap out the distributions to the c++11. After this PR, we no longer depend on boost random.

The c++11 versions allow us to simplify a couple of things:

1. C++11 provides a true-random generator, which can replace our complicated, platform-specific version.
2. C++11's mt19937_64 benchmarks as one of the fastest random number generators on modern hardware (e.g. https://gist.github.com/MikeLing/d258cf0c7e18d17639c577a695dbec41), so there is no point in having separate fast_ versions. This PR consolidates these. This change is in the second commit.

[TobyRoseman]

@hoytak - will this change impact our users? Is there functionality where the same data and the same seed will now produce different results? If so, what functionality is affected?