[NPLB] Support SetTimeZone extension on win

[MarekLuxoft]

In order to test SbTimeZoneGetCurrent(), we need to set a time zone first. Here we add such functionality for win32 platform (without UWP/Xbox).

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[TyHolc]

It looks like the win32 test failed. There's also an odd looking android failure but that doesn't seem related.

Can you also make sure to sign the CLA agreement (or if you've already signed it follow the troubleshooting steps listed there).

[TyHolc]

All of the win32 files look good to me if you've tested and it's working. One thing I noticed was that this might require special privileges for the application, so just verify that it works on the environment you're targeting (in this case on a windows machine but not necessarily an Xbox since you're not fixing this for UWP).

I'll leave the nplb changes to be reviewed by someone else.

[TyHolc]

I'm gonna update the branch to see if some of the failing tests will pass. If not we'll need to dig into why they're failing and confirm this PR isn't the cause before submitting.