[issue5412] extend configparser to support mapping access(__*item__)

[Ray.Allen]

Ray.Allen <ysj.ray at gmail.com> added the comment:

> Note that the two versions are not exclusive: We can look for an item if a tuple is given and look for a section if it’s a string. Maybe confusing.

+1. I think this is a good idea. Getting a section and Getting a key-value are both very common operations when parsing "ini" config file. Both operations should be supported conveniently.

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