gstreamer1: Add gstreamer version 1.0.7 package

This patch adds the gstreamer version 1.x series to buildroot.
gstreamer: update Config.in with gstreamer1 info.

Update the gstreamer1 Config.in with note about Gstreamer 0.1X being
incompatible with gstreamer 1.X.
gst1-plugins-base: add gstreamer1 base plugins

Adds gstreamer 1.X base plugins.
gst1-plugins-good: add gstreamer1 good plugins

Adds gstreamer 1.X good plugins.
gst1-plugins-bad: add gstreamer1 bad plugins

Adds gstreamer 1.X bad plugins
gst1-plugins-ugly: add gstreamer1 ugly plugins

Adds gstreamer 1.X ugly plugins
gst1-plugins-good: add libvpx support

adds libvpx support to gst1-plugins-good
gst-omx: add gst-omx package

gst-omx enables OpenMAX based accelerated video decode.
multimedia: Reorganize Config.in