Cocoa: event dispatcher drops events on the floor

Under some circumstances, the event dispatcher needs to stop
NSApplication, let the control return back to the QEventLoop that
called processEvents, which very often will just call processEvents
again, which in turn will restart NSApplication.
After stopping NSApplication, Cocoa seems to throw away at least some
of the posted cocoa events that are still pending. This will offcourse
have inpact on things like window updates etc. that never happends.

This patch will be more careful about when to stop NSApplication, and
delay this until the run loop has finished one more spin after interrupt
has been called. The same goes for modal sessions. Introducing this delay
also made it neccessary to sometimes block cocoa from updating the
stacking order of the windows.

Autotest: qcoreapplication, qapplication, qtimer

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