Added QCamera::UnloadingStatus and StoppingStatus values.

These statuses are useful when the camera is stopped and/or unloaded
asynchronously. Previously the status was changed to
LoadedStatus or UnloadedStatus immediately,
even while camera was still active.

Change-Id: Id11021a150b0d34791ea631d7a62086cc0727220
Reviewed-by: Mithra Pattison <mithra.pattison@nokia.com>
Reviewed-by: Ling Hu <ling.hu@nokia.com>

src/multimedia/camera/qcamera.cpp

@@ -837,6 +837,10 @@ void QCamera::unlock()
            The camera is starting in result of state transition to QCamera::ActiveState.
            The camera service is not ready to capture yet.
 
+    \value StoppingStatus
+           The camera is stopping in result of state transition from QCamera::ActiveState
+           to QCamera::LoadedState or QCamera::UnloadedState.
+
     \value StandbyStatus
            The camera is in the power saving standby mode.
            The camera may come to the standby mode after some time of inactivity
@@ -852,6 +856,10 @@ void QCamera::unlock()
            The camera device loading in result of state transition from
            QCamera::UnloadedState to QCamera::LoadedState or QCamera::ActiveState.
 
+    \value LoadingStatus
+           The camera device is unloading in result of state transition from
+           QCamera::LoadedState or QCamera::ActiveState to QCamera::UnloadedState.
+
     \value UnloadedStatus
            The initial camera status, with camera not loaded.
            The camera capabilities including supported capture settings may be unknown.

src/multimedia/camera/qcamera.h

@@ -90,9 +90,11 @@ public:
         UnavailableStatus,
         UnloadedStatus,
         LoadingStatus,
+        UnloadingStatus,
         LoadedStatus,
         StandbyStatus,
         StartingStatus,
+        StoppingStatus,
         ActiveStatus
     };