[Development] QVariant container API

[Vasily Pupkin]

> By the way, conversions through QVariant are *exactly* what I implemented
in
> the examples/corelib/serialization/convert tool.

Right, I've seen these to be helpful.

The global task would allow to code like this.
~
struct MyStruct
{
    int property1;
    QString property2;
};

class MyObject
{
    Q_OBJECT
    ...
public slots:
    void mySlot(const QList<MyStruct>& value);
}

QJsonDocument doc(...);

QMetaMethod mySlot(...);

JsonDeserializer deserializer;

QVariant parameter;
if(deserializer.deserialize(doc,  mySlot.paremeterType(0), parameter)
    invoke(...);
else
{
    //error
}
~

The only difference from examples, is that library user specifies, what
datatype should be produced. This would alllow to significantly reduce the
amount of boilerplate code.
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