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These are intended to be used as smart wrappers on top of get_* and
set_* methods. In case of get_t method you can specify type you are
expecting like a python type (str, bool and int). In case of set_t is
type autodetected from provided value.

This reverts commit 2eb7d6cd.

This is better Python3 syntax and with no Python2 support we can do
this.

If key doesn't exist in uci, default value will be returned

Python 2 is almost EOL. This frees our hands to use Python3 only syntax
that is not available in Python 2.

We should not commit every time we exit from context because that can
take a long time. This remembers if some changes could have been done
and otherwise we do not commit on exit.

This reverts commit c1e2e8cf.

We are going to drop Python 2 completely.

This adds support for usage with python `with` statement.

This project is in reality licensed under MIT license.

There is difference in how string should be handled in Python 2 and 3.

This is just first working version. There is still a lot of work to be
done before it's even fully usable.