[Bug 739090] validate: [tracker] Clean up, refactor and document the launcher more extensively.

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=739090
  GStreamer | gst-devtools | git

Bug 739090 depends on bug 739208, which changed state.

Bug 739208 Summary: validate-launcher: tool-assisted cleanup and commit hook update.
https://bugzilla.gnome.org/show_bug.cgi?id=739208

           What    |Old Value                   |New Value
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |FIXED

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