more work on caps negotiation. we now reach common caps
more work on caps negotiation. we now reach common caps

sledges/gst-droid,sledges/gst-droid,foolab/gst-droid,mlehtima/gst-droid,mlehtima/gst-droid,sledges/gst-droid,sailfishos/gst-droid,foolab/gst-droid