[Cuis-dev] Theme cleanup, and respect taskbar theme setting

[Luciano Notarfrancesco]

This change set cleans up Theme a bit, removing notifications of window
opening and closing (I added these notifications some years ago in order to
support my tiling window manager).

Also, when recreating the desktop (for example after changing the font),
make sure to respect the Theme setting of useTaskbar (if false, don't
recreate the taskbar).
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