Debugger: Set tooltips on Step into/Next.

Indicating they'll do Stop & Break at main().
Do not display for QML projects.

Change-Id: I10b6ee381f17dca89c7152e38514fb95776bc329
Reviewed-on: http://codereview.qt.nokia.com/1777


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