GUIInvoke takes a QObject* to avoid callbacks after object lifetime

* The GUIInvoke object takes a QObject, and uses QPointer to check that
  it hasn't been deleted when the callback fires. This prevents delayed
  callbacks from executing after the object has been deleted and
  crashing.
* In most cases the pointer is just 'this'.

qrenderdoc/Windows/EventBrowser.cpp

@@ -436,7 +436,7 @@ void EventBrowser::on_timeDraws_clicked()
 
     m_Times = r->FetchCounters({GPUCounter::EventGPUDuration});
 
-    GUIInvoke::call([this]() {
+    GUIInvoke::call(this, [this]() {
       SetDrawcallTimes(ui->events->topLevelItem(0), m_Times);
       ui->events->update();
     });