Initialize global variables in the right place.

The rules for what messages are sent at window creation -- and in
which order -- are neither intuitive or clear. WM_CREATE can NOT be
relied upon to initialize global state required by handlers of other
messages (such as WM_GETMINMAXINFO, which seems to be sent before
WM_CREATE).

Thus, the better solution is to initialize everything using a CBT hook
before the window procedure is even run. Because CBTProc creates
(child): windows of its own, though, one must be careful to only run
the initialization once, which is done by checking g_hWnd.

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