queue2: add bufferlist support
queue2: add bufferlist support

We want to maintain buffer lists if possible.

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