Convert Qt examples to Qt5.

src/Cxx.md

src/Cxx/Qt/BorderWidgetQt.cxx

src/Cxx/Qt/BorderWidgetQt.ui

src/Cxx/Qt/BorderWidgetQtDriver.cxx

src/Cxx/Qt/CMakeLists.txt

src/Cxx/Qt/EventQtSlotConnect.cxx

src/Cxx/Qt/EventQtSlotConnect.ui

src/Cxx/Qt/EventQtSlotConnectDriver.cxx

src/Cxx/Qt/RenderWindowNoUiFile.cxx

src/Cxx/Qt/RenderWindowUIMultipleInheritance.cxx

src/Cxx/Qt/RenderWindowUIMultipleInheritance.ui

src/Cxx/Qt/RenderWindowUIMultipleInheritanceDriver.cxx

src/Cxx/Qt/RenderWindowUIMultipleInheritanceDriver.md

src/Cxx/Qt/RenderWindowUISingleInheritance.cxx

src/Cxx/Qt/RenderWindowUISingleInheritance.ui

src/Cxx/Qt/RenderWindowUISingleInheritanceDriver.cxx

src/Cxx/Qt/RenderWindowUISingleInheritanceDriver.md

src/Cxx/Qt/ShareCameraQt.cxx

src/Cxx/Qt/ShareCameraQt.ui

src/Cxx/Qt/ShareCameraQtDriver.cxx