Fix WM_CLOSE handling
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Description

Fix WM_CLOSE handling

* src/windowmessages.h (add_explorer, remove_explorer): Use LPDISPATCH
* src/windowmessages.cpp (add_explorer, remove_explorer): Update
accordingly.
(gpgol_hook): Use FindWindowEx to find all explorer windows.
* src/gpgoladdin.cpp (install_explorer_sinks): Register explorer
dispatch.
* src/explorer-events.cpp (EVENT_SINK_INVOKE): Remove explorer
on close.

At least with Outlook 2016 casting to IOlewindow and using
GetWindow did not work anymore. The returned handle was always 1.
FindWindowEx should work reliably.