elementfactory: annotate some of the type defines for g-i
elementfactory: annotate some of the type defines for g-i

Type is not picked up yet though, and we still need
to annotate values for the 'simple' defines.

https://bugzilla.gnome.org/show_bug.cgi?id=677925

krieger-od/gstreamer,Lachann/gstreamer,shelsonjava/gstreamer,jpakkane/gstreamer,lubosz/gstreamer,justinjoy/gstreamer,ensonic/gstreamer,justinjoy/gstreamer,mparis/gstreamer,cfoch/gstreamer,ensonic/gstreamer,krichter722/gstreamer,surround-io/gstreamer,cablelabs/gstreamer,StreamUtils/gstreamer,centricular/gstreamer,lovebug356/gstreamer,collects/gstreamer,centricular/gstreamer,krieger-od/gstreamer,mparis/gstreamer,StreamUtils/gstreamer,mparis/gstreamer,surround-io/gstreamer,krieger-od/gstreamer,lubosz/gstreamer,StreamUtils/gstreamer,jpakkane/gstreamer,jpxiong/gstreamer,cablelabs/gstreamer,surround-io/gstreamer,collects/gstreamer,jpxiong/gstreamer,krichter722/gstreamer,jpakkane/gstreamer,cablelabs/gstreamer,Lachann/gstreamer,centricular/gstreamer,Lachann/gstreamer,krichter722/gstreamer,collects/gstreamer,shelsonjava/gstreamer,lovebug356/gstreamer,cablelabs/gstreamer,jpxiong/gstreamer,ensonic/gstreamer,krichter722/gstreamer,jpakkane/gstreamer,cfoch/gstreamer,cablelabs/gstreamer,lovebug356/gstreamer,mparis/gstreamer,jpxiong/gstreamer,shelsonjava/gstreamer,shelsonjava/gstreamer,ensonic/gstreamer,lubosz/gstreamer,ensonic/gstreamer,cfoch/gstreamer,lubosz/gstreamer,StreamUtils/gstreamer,centricular/gstreamer,Lachann/gstreamer,collects/gstreamer,lovebug356/gstreamer,lovebug356/gstreamer,krieger-od/gstreamer,justinjoy/gstreamer,centricular/gstreamer,cfoch/gstreamer,cfoch/gstreamer,jpxiong/gstreamer,jpakkane/gstreamer,lubosz/gstreamer,shelsonjava/gstreamer,surround-io/gstreamer,collects/gstreamer,krichter722/gstreamer,justinjoy/gstreamer,krieger-od/gstreamer,Lachann/gstreamer,mparis/gstreamer,justinjoy/gstreamer,surround-io/gstreamer,StreamUtils/gstreamer