[native] Make the native part cross-platform

[ara-ayvazyan]

There are several components that have Windows-specific implementation (e.g. thread pool, named events) which can be expanded with corresponding cross-platform versions.

[edwardchanjw]

The best case: For C# part, run on .NET Core / Standard 2.0. (Two C# apps able to IPC each other) For C++ part, compatible with Cross Platform (Two C++ apps able to IPC each other) Eventually, C++ and C# inter-operable with each other on top on base Unix?