Use gst_element_class_set_static_metadata()
Use gst_element_class_set_static_metadata()

where possible. Avoids some string copies. Also re-indent
some stuff. Also some indent fixes here and there.

GStreamer/gst-plugins-good,pexip/gst-plugins-good,GStreamer/gst-plugins-good,GStreamer/gst-plugins-good,GStreamer/gst-plugins-good,pexip/gst-plugins-good,pexip/gst-plugins-good,pexip/gst-plugins-good,pexip/gst-plugins-good