QCameraExposureControl:
Separated requested from actual exposure values.
Removed ParameterFlags, it's confusing and seldom used.
Moved ExposureMode and MeteringMode to parameters.
QCameraExposure:
Added requestedAperture/ShutterSpeed/Iso getters
Change-Id: I408586d85e6c9de0c8a711c32b3c90ea46052270
Reviewed-by: Michael Goddard <michael.goddard@nokia.com>