Debugger display in separate windows currently opens several
widgets without title at the same location that disappear
below the main window when stepping.

Put them in a tabwidget and raise it when setting new values.

Task-number: QTCREATORBUG-8344
Change-Id: Icb6dd8942ab851aeeb6a9248c4a1360e8841cf61
Reviewed-by: hjk <qthjk@ovi.com>