Removed plugable schedulers.
Original commit message from CVS: Removed plugable schedulers. Removed Scheduler/Manager from elements. Removed gsttypes.h, rearranged includes. Removed dependency pad<->element, element<>pipeline, and various others, fix includes. implement gst_pad_get_parent() with gst_object_get_parent() Make GstTask sefcontained. Fix _get_state() on GstBin, it did not return ASYNC with a 0 timeout. Fix endless loop in iterator_fold_with_resync.
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