KUser windows port and small API changes

[Nhuh Put]

Hello
I would like to commit this patch on next Monday.
It's a Windows Port of KUser.
As things like room number and phone number are not available on windows, I
removed those methods and added a generic extendedProperty(const QByteArray)
This is only used in one place in kdebase, I would port the user.
I would also rename kuser.cpp to kuser_unix.cpp

	PutHuhn
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