Recording on Android

This was one of the 4 Qt Multimedia subsystems where there is feature implementation work remaining, this is the most complex one out of the four.

    - capturing and playback
        - Basic capture/Recording needs: 
            -QPlatformMediaCapture
            -QPlatformFormatsInfo (could be a stub for only one format)
            -QPlatformCamera
            -QPlatformMediaEncoder
        - Taking pictures needs QPlatformCameraImageCapture in addition
        - Advanced camera features need 
            -QPlatformCameraExposure
            -QPlatformCameraFOcus
            -QPlatformCameraImageProcessing
        - qmediacapturesession, qmediaformat,.. linked to qplatform.. backend classes
            -audio, codecs, image
        - viewing as videoframes
            -fullscreen (exists for android?)
            -native window (android implementation missing)
        -qvideosink and qvideoframe for both capturing and playback