Randomgen

This release contains a single enhancement:

* Enable randomgen bit generators to be used with NumPy's Generator or RandomState.

This is a major release that removes the deprecated classes ``Generator`` and ``RandomState``.

This is a minor release that fixes one bug that is hard to encounter and improves installation.

The one bug fix affects PCG-type generators `advance` when using Windows or a 32-bit system and advancing more than 2**64 steps.

This release removed features not available in Python 3.6 so that the supported Pythons include 3.7 - 3.9.

This is a bug fix and feature release. The highlights are:

* Fixed a bug in `SFC64` the used the wrong value from the Weyl sequence.
* Added `mode="numpy"` where the sequence generated is guaranteed to match the sequence produced using the NumPy implementations.
* Added `ExtendedGenerator.random` with support for `dtype="longdouble"` to produce extended precision random floats.

This is a feature and bugfix release.

Two new distributions:

* Wishart
* Multivariate Complex Normal

have been added to `ExtendedGenerator`. There is also one bug fix that can affect `standard_gamma` when using `out`.