Add convenience imports and docs to the base pydiffx module.
Review Request #11738 — Created July 21, 2021 and submitted
This adds the most common imports to the
pydiffxmodule, making it
very easy to import
DiffXWriter, and various
objects holding option constants.
This module has been given some basic introductory documentation and
a reference to the DiffX spec.
Tested importing from this module.