The list of all applications was based on the items that show up in
the menus, and might not have contained all applications returned
by the AppMonitor for the most used applications request. One example of
such an application was Evince. This resulted in a crash when an
application we did not prepare the info for was returned as one of the
matches by the AppMonitor, so we now include all applications returned
by the AppMonitor in the list, in addition to the ones from the menus.
Also mark apps as stale when we catch a "changed" signal from the AppMonitor
to ensure that the cache is refreshed.
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