Windows implementation

[ndusart]

This add support for Windows platform.

I used the mio-named-pipes crate to implement that easily without having to copy files from mio to use structs that are not public.

As its name implie, this crate allow to read/write to a named pipe which is basically implemented using ReadFile/WriteFile api just as what we have to use for COM ports.
The only difference reside in the way to create that file which is then handled specifically in Serial::from_path.

This is based on serialport-2 branch as we need a new function (not merged yet) to create a COMPort with a handle directly. Allowing to open the file for asynchronous operations.
I'll have to switch to the crates.io serialport when published.

I modified the example to build on Windows too.
As async API is completion-based on Windows, readiness is actually updated only when read is actually performed. so we got a lot of "Read would have blocked." in the output as it is readable even if no bytes are available. That's inherent to mio

[berkowski]

Well happy new-year!

I'll keep track of your progress on serialport-rs: https://gitlab.com/susurrus/serialport-rs/merge_requests/25. When that goes through at least we can keep the serialport-rs git link pointed at the main repository.

I don't have any experience with rust on windows, so thank you very much for pushing the initiative along!

[Susurrus]

I just released 2.1 of serialport-rs to crates.io, so at least that part is done now.

[berkowski]

@ndusart Looks like the "examples/win_test.rs" isn't included? Otherwise looks ready to go.

[ndusart]

I removed the example reference in Cargo.toml.
It was a basic test I made when first iterating over my implementation. It does not add any value to the existing example, and I don't have it now anyway.