QML Drag and Drop including reordering the C++ model

This guide shows you how to implement drag and drop in Qml including how to reorder the backing C++ (`QAbstractListModel` derived) data model. Most QML Drag and Drop examples you find online, including the Qt official example, use a `ListModel` in the same Qml file which has the data, but no example I found actually reordered a C++ model. This example has a simple `MVVM (model-view-viewmodel)` C++ structure and a QML file with a drag and drop grid. The dragable example items come from the C++ mo...

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