Also added a new QtMultimedia global object which makes it possible to retrieve the list of available cameras. It can be extended with new utility functions in the future. Includes documentation, example and auto tests. Task-number: QTBUG-23770 Change-Id: Ifea076329c3582ea99246ee1131853344a7b773f Reviewed-by: Christian Stromme <christian.stromme@digia.com>