MER: Add packaging.
Allow gstreamer to supply the default volume and muting of a stream.

GStreamer's normal default volume is 1.0 and unmuted, so explicitly setting
these values in the normal case isn't necessary.  In some unusual cases
changing the volume properties may change the application or global volume
and in those circumastances it's better to not change the volume.

Change-Id: I66130421f6096e396b748fcc651af20dff197eda
MER: Add enablers for working with camera rotation in gstreamer.

Includes a prototype control for reporting the orientation of the camera
sensor, and propagation of rotation information to the muxer element.

Change-Id: I7542cc54a253031b0692780f368cf31c65182d96
Implement customFocusPoint in camerabin backend.

Send a regions-of-interest event containing a rectangle surrounding the
focus point to the camera source when the camera's focusPointMode
is QCameraFocus::CustomFocusPoint.  Reset the regions-of-interest if the
focusPointMode changes to any other value.

[ChangeLog][QtMultimedia][GStreamer] Implement customFocusPoint in camerabin backend.

Change-Id: If75405733b18d476dff5467abae3f08271caf06a