devel/py-setoptconf: Add py-setoptconf 0.3.0

setoptconf is a Python library that can be used to retrieve program settings
from a variety of common sources:

• Command Line
• Environment Variables
• INI Files
• JSON Files
• YAML Files
• Python Objects/Modules

The goal of this project is to define your desired settings in a simple and
consistent way, and then point setoptconf at as many of the sources as you'd
like to use, and let it comb them all, looking for your settings.