Send DeferredDelete events explicitly in our main event loop

* It's not entirely clear if this is the intended fix, but otherwise
  since we're not running QApplication::exec() the main event loop has
  the same 'loop level' of 0 as the event level when it's fired. The
  proper functioning seems to be that the posted deleteLater event
  should have an event level of 1 which then means it will be processed
  when coming back to the exec() loop level of 0, but since we don't get
  that, just run it manually after all other events.

qrenderdoc/Code/qrenderdoc.cpp

@@ -234,6 +234,7 @@ int main(int argc, char *argv[])
       {
         application.processEvents(QEventLoop::WaitForMoreEvents);
         QCoreApplication::sendPostedEvents();
+        QCoreApplication::sendPostedEvents(NULL, QEvent::DeferredDelete);
       }
 
       config.Save();