Fix setuptools package discovery

[MarkKoz]

I tried to install this package on Python 3.9 with pip 23.3.1 and setuptools 68.2.2. It incorrectly installs the package into the root site-packages directory (instead of within an h2p_parser subdirectory). The module is not importable when installed this way.

I don't really know why setuptools installs it that way, but the config seemed relatively complex for what this package needs. package_dir seems unnecessary since the package is in the root directory:

If your packages are not in the root of the repository or do not correspond exactly to the directory structure, you also need to configure package_dir:

(https://setuptools.pypa.io/en/latest/userguide/package_discovery.html)

[MarkKoz]

Okay this doesn't seem to work — I was initially testing with the repo as the cwd, so I missed this:

>>> import h2p_parser
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\Users\Mark\Desktop\virtualenv\lib\site-packages\h2p_parser\__init__.py", line 20, in <module>
    from h2p_parser import data
ImportError: cannot import name 'data' from partially initialized module 'h2p_parser' (most likely due to a circular import) (C:\Users\Mark\Desktop\virtualenv\lib\site-packages\h2p_parser\__init__.py)

Not sure why this is a problem.

[MarkKoz]

Right, so I was only including the root package and not subpackages. Subpackages would have to be explicitly included when providing a list. So instead, I switched to find_packages.