QmlDebugger: Also show status of QDeclarativeEngine client in log

Fix QDeclarativeEngineDebug to use the same enum as the other clients.
Also, use objectName() to name the clients.

Change-Id: I826970bf248ce2f50c4bf66c1f58c0b9b56698b1
Reviewed-on: http://codereview.qt-project.org/5231


Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Aurindam Jana <aurindam.jana@nokia.com>