Add type hints and set up Mypy about vpn-slice HOT 5 OPEN

I think Debian Jessie ships Python 3.4 but support should end about now. I don't think distributions even further behind are going to package vpn-slice anytime soon so I guess dropping support for <3.5 won't cause much trouble.

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I got a tad bit carried away earlier, and I did some data modeling on the environment, wrote a parser, and wrote tests for it. I've pushed that up to a branch, but I can open a WIP PR with it if folks would prefer that mechanism for discussing. The question here is basically "do I have the right data model?"

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A mere 3 years later (:sweat_smile:), I started trying to do something similar in the typing_annotations branch.

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@gmacon This sounds great. I have no issues with Python 3.5 as the minimum requirement. Ubuntu 16.04 comes with Python 3.5, and it's olllllllllld.

Doesn't seem like attrs-vs-data-classes will be too hard to combine, and it is indeed probably worth supporting Python 3.5-3.6.

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I've realized that using data classes or attrs-as-data-classes requires Python 3.6 to get the variable annotation syntax. To keep 3.5, we'll need to use attrs unconditionally.

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