To control the visibility of variables, ModuleDocumenter have to load
docstring of them on `get_object_members()` phase. This reimplements
it and `get_module_members()` helper to fetch docstring on earlier
phase (as ClassDocumenter does).
Keep imports alphabetically sorted and their order homogeneous across
Python source files.
The isort project has more feature and is more active than the
flake8-import-order plugin.
Most issues caught were simply import ordering from the same module.
Where imports were purposefully placed out of order, tag with
isort:skip.
A common use case for this is a class like `namedtuple`, which has a public `_replace` method that is so-named in order not to conflict with arbitrary user-provided attributes.
Rejected spellings include:
* `:meta not-private:`
* `:meta private: False`
