update libvisual blocking hack for gst1

libvisual was causing problems before, and we don't use it anyways
gst-1 renamed decodebin2 to decodebin and playbin2 to playbin

Conflicts:
	components/mediacore/gstreamer/src/sbGStreamerService.cpp
update gstmozilla plugin for gstreamer-1.0

Conflicts:
	components/mediacore/gstreamer/gst-plugins/mozilla/Makefile.in
fix warning in mozilla plugin

(gst-plugin-scanner:10515): GStreamer-WARNING **: Invalid plugin name
'"mozilla"' - fix your GST_PLUGIN_DEFINE (remove quotes around plugin
name)
update stub gst_libs_*.txt files for gst-1.0