Replace hard distinction between 'out', 'err' with flexible
OutputFormat. Also make sure that QmlProfiler shows application output.

Change-Id: I130c71884321e4c59c9a75f0836c37a7f0e805c4
Reviewed-on: http://codereview.qt.nokia.com/458


Reviewed-by: Christiaan Janssen <christiaan.janssen@nokia.com>