Both the Debugger View and the QML Script Console use
executeDebuggerCommand(...). Forward this to QmlEngine if
the QmlEngine is stopped (because only then teh QML Script Console
is enabled), to C++ otherwise.

Change-Id: I4ba72b56a6205db5346e167b85e9353d05adae41
Reviewed-on: http://codereview.qt.nokia.com/2829


Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Christiaan Janssen <christiaan.janssen@nokia.com>