Added a re-implementation of QSound, using functionality derived from
QSoundEffect. QSound API remains the same as the original 4.x version.
It offers both a static interface (with auto resource cleanup on sound
completion), as well as an object instance interface for more detailed
control.
Change-Id: I85c00dd88547f8dea9b1e1ef2da31d2f2e28a172
Reviewed-by: Michael Goddard <michael.goddard@nokia.com>