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Previously, the timing.c subsystem worked in Windows PuTTY by means of scheduling WM_TIMER messages to be sent to the terminal window. Now it uses a separate hidden window instead, and all the machinery for handling that window lives on its own in windows/utils/gui-timing.c. Most immediately, this removes a use of wgs.term_hwnd that will become awkward when I move that structure in a following commit. But also, it will make it easier to add the same timing subsystem to unrelated GUI programs, such as Windows Pageant: if we ever decide to implement automatic deletion or re-encryption of unused keys after a timeout, this will help make that easier.