lowlevel cleanup log


structures in the following classes were aligned to 1.8:
(https://cgit.freedesktop.org/gstreamer/gstreamer/tree/?h=1.8)

- BaseSinkAPI
- BaseSrcAPI
- BaseTransformAPI
- GstAPI
- GstBufferAPI
- GstBufferPoolAPI
- GstControlSourceAPI
- GstControllerAPI - removed
- GstElementAPI
- GstEvent
- GstObject
- GstPadProbeInfo
- GstQueryAPI
- GstSampleAPI