A simple ping library, parsing strings into IPv4 address

We've just spent a lot of time abstracting over LoadLibrary, but we still have all the gory details of the Win32 ICMP API straight in our main.rs file! That won't do.

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Designing and implementing a safer API on top of LoadLibrary

It's refactor time!

Our complete program is now about a hundred lines, counting blank lines (see the end of part 3 for a complete listing).

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