Q_INVOKABLE with NOTIFY support

There are some use cases where you would like to make a QML binding to a function that can change based on e.g. some system level properties.

For example:

class Screen : public QObject
{
...
Q_INVOKABLE QString resourcePath(const QString &path);
}

...where the return value of "resourcePath" depends on the screen resolution and/or dpi

And in QML you would write:

Loader

(Yes... Screen properties do not change in run-time in real life, but they could do so in testing environment)