process::Process::cwd for Windows

[svartalf]

No description provided.

[sandorex]

Only way i've found is this https://stackoverflow.com/a/2967713/6251201 but it's not really elegant it may flag be flagged as malware

[svartalf]

I think heim should does the same to what psutil does, see: https://github.com/giampaolo/psutil/blob/544e9daa4f66a9f80d7bf6c7886d693ee42f0a13/psutil/arch/windows/process_info.c#L53-L371

Nt* functions are provided by ntapi crate, but I had not found any crate that provides PEB structures (meaning we should embed them) and these "WoW" checks looks kinda hard, but it seems to be better option, as PEB could be used for other Process methods too

[sandorex]

The api may change in the future unfortunately

[NtQueryInformationProcess may be altered or unavailable in future versions of Windows. Applications should use the alternate functions listed in this topic.] 

[roblabla]

In practice the API is unlikely to change. It has stayed stable for a long time now, and there are a lot of software relying on this trick to acquire the CWD. If this is ever broken, it'll likely come with an API to properly get the CWD without these hacks, which we'll be able to use from this point on.

I'll be implementing this the same way psutil does, and opening a PR soon.