Add GWin32InputStream and GWin32OutputStream classes
Correspond to GUnixInputStream and GUnixOutputStream. No true async support though. But that is how the Win32 API is, for files not explicitly opened for so-called overlapped IO. The API to create these streams takes Win32 HANDLEs. Not file descriptors, because file descriptors are specific to the C library used. The user code and GLib might be using different C libraries. Also add a test program for the new classes, and a gio-windows-2.0.pc file.
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