completion-helper: Add filtering by klass and sink caps.
completion-helper: Add filtering by klass and sink caps.

jpxiong/gstreamer,mparis/gstreamer,shelsonjava/gstreamer,StreamUtils/gstreamer,shelsonjava/gstreamer,mparis/gstreamer,shelsonjava/gstreamer,shelsonjava/gstreamer,mparis/gstreamer,centricular/gstreamer,krichter722/gstreamer,StreamUtils/gstreamer,jpxiong/gstreamer,StreamUtils/gstreamer,krichter722/gstreamer,mparis/gstreamer,krichter722/gstreamer,jpxiong/gstreamer,krichter722/gstreamer,mparis/gstreamer,shelsonjava/gstreamer,krichter722/gstreamer,StreamUtils/gstreamer,jpxiong/gstreamer,centricular/gstreamer,StreamUtils/gstreamer,jpxiong/gstreamer,centricular/gstreamer,centricular/gstreamer,centricular/gstreamer