Backport of "gst-inspect: prettier signal printing and print action signals in g_signal_emit_by_name() format" into 1.22
requested to merge tpm/gstreamer:mr-4299-backport-into-1.22-gst-inspect-action-signal-printing into 1.22
Backport of !4299 (merged) "gst-inspect: prettier signal printing and print action signals in g_signal_emit_by_name() format".
Commits: