Windows build updates.
Merge commit '97084a64173db84f1c4a72a2de9479e48f8b68b0' into memleaks-instrumentation

* commit '97084a64173db84f1c4a72a2de9479e48f8b68b0':
  added missing MouseActivateWindowEvent
  - missing code from windows impl (required for Qt::WindowDoesNotAcceptFocus to work properly)
Merge commit '4baf36820758b1185ff681fd5f3e6e1020349812' into memleaks-instrumentation

* commit '4baf36820758b1185ff681fd5f3e6e1020349812':
  Leaking of QQmlDelegateModel in QQmlInstantiatorPrivate::makeModel has been fixed.
Merge branch 'origin/ywm'