Added support for live sources and other elements that cannot do preroll.
Original commit message from CVS: Added support for live sources and other elements that cannot do preroll. Updated design docs, added live-source design doc. Implemented live source functionality in basesrc Fix error condition in _bin_get_state() Implement live source handling in -launch. Added check for live sources. Fixed case in GstBin where elements were changed state multiple times.
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