Squish: Handle sporadic missing visibility on Mac

Change-Id: I7e2694ced72ee836ad6c532f642914d802acb0c2
Reviewed-by: Robert Loehning <robert.loehning@digia.com>
QmlProfiler: Make sure y-offset in category labels is an integer

This is only a workaround, for older versions of Qt. The real bug is
that a non-integer y offset is interpreted inconsistently by QtQuick.

Task-number: QTCREATORBUG-11732
Change-Id: Idcad0bf0cbef58b41c45e38aa29596717523ed0b
Reviewed-by: Christian Stenger <christian.stenger@digia.com>