qt: seek while dragging seek bar
qt: seek while dragging seek bar

removed time label on top the seek bar, should be placed elsewhere

sdroege/gst-player,sdroege/gst-player,amorenoc/gst-player,amorenoc/gst-player,sdroege/gst-player,sdroege/gst-player,amorenoc/gst-player,sdroege/gst-player,amorenoc/gst-player,amorenoc/gst-player