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Improves the interaction responsibility.

Don't wait anymore that processes have finished. Simply connect the
finished signal to deleteLater().

If FORWARD_QMLPUPPET_OUTPUT is set the output of qmlpuppet is forwarded.

Much faster.

The two socket approach don't worked under windows and mac.

Pixmaps can be very large, so they are slow down the pipeline. Now there
is a extra socket for images.

This notifies the views if the instance has be really instanced.

Because the order of the commands can be changed the reparenting was
changed. Now there is a command with the exact order of child items so
it should be much more correct.

The complete qml emulation layer (instances) is moved
into another external process (qmlpuppet).

Summary of architectural changes:

- Asynchronous messaging
    Handling commands and data transfer asynchronously reduces the
    amount of context switches between processes.

- Proxy classes for client process
    This classes abstract the inter process communication

- QVariant based command parsing and serialization
    Using LocalSocket in bidirectional manner for communications
    of commands and data transfer.

- Integer based identifier instead of ModelNode in client process
    The qml emulation layer (instances) has no more depencies to our
    internal data model.

- Timer based rendering
    Rendering in instances is controlled by a timer. Only dirty items
    are updated.