* See https://bugreports.qt.io/browse/QTBUG-56382 for more details -
creating DXGI swapchains adds a windows hook, and enough windows hooks
forces out Qt's internal hook which it relies upon for proper event
processing.
* GUIInvoke helper changed to use QMetaObject::invokeMethod which works
on threads better.
* LambdaThread helper class now has a thread member, it doesn't derive
from thread (this seems to be recommended practice).