The stub for an example with tree edit feature
The first production ready version

1. The examples markup updated to the qcubed v2.2 rules
2. The modified tree data can be accessed on a PHP part with the DataSource property as an associative array.
3. The context menu items are localized with usual `QApplication::Translate` function.
The event for tree items selection is added

And other improvements.
The new release build