Update C++-QML integration flowchart

https://doc.qt.io/qt-5/qtqml-cppintegration-overview.html#choosing-the-correct-integration-method-between-c-and-qml needs updating for 5.14 since there are new ways to do it.

See this commit for the .odg file used for the flowchart:

https://codereview.qt-project.org/c/qt/qtdeclarative/+/225021