Rework setup project

Closes #2 (closed)

• Use toml instead of setup.py
• Use setuptools_scm instead of the custom release.py generator
• Make sure the resources are part of the lib package

Here is the result with setuptools_scm.

The result is probably not exactly the same, but who cares.

I did expose video_streamer_mpeg.__version__, and video_streamer_mpeg.version_info (version_tuple)

In [1]: import video_streamer_mpeg

In [3]: video_streamer_mpeg.version_info
Out[3]: (0, 1, 'dev36+g0d1b7e0', 'd20210809')

In [4]: video_streamer_mpeg.__version__
Out[4]: '0.1.dev36+g0d1b7e0.d20210809'