Need ProcessMonitor windows support

[Triangle345]

Currently the process monitor is only written/works for linux.

For windows one would need to use the createprocess call:
https://msdn.microsoft.com/en-us/library/windows/desktop/ms682425(v=vs.85).aspx

[lispmeister]

Any PR will be gratefully accepted.

[SeanTAllen]

Ideally, I think this should be delayed until #1014 is completed. Then, we can make sure that they are feature equivalent. However, #1014 has been open for a long time so I don't think that is actually reasonable. Rather, whoever implements ProcessMonitor support for Windows needs to be aware of the issue that is still outstanding in the *nixen version.

[Triangle345]

I started working on this somewhat.. at the very least I can contribute a thin c wrapper for windows processes. Then maybe start incorporating it into proc monitor.

[jemc]

@Triangle345 Thanks!

[Triangle345]

How should we test this functionality. Should I add a windows section to the test file? I notice it is currently linux specific.

[SeanTAllen]

Yes. If tests that are currently Linux and OSX only pass then we can feel confident that Windows support is working.

[SeanTAllen]

@Triangle345 once that is in place, if you are interested in further extending ProcessMonitor support then you could revive this PR to bring async write buffering support (which would then be across platforms). Its old and somewhat dated but could serve as a good basis for additional work.

#1014

[cquinn]

It looks like #2186 solves the problem identified in #1014, so that should be out of the way.

[SeanTAllen]

@cquinn I think this can be closed, do you agree?

[cquinn]

Yes, I think so. ProcessMonitor on Windows could be improved, but it works OK.