[Bug 772936] Allow outputting logs (in particualr tracer logs) in Common Trace Format (ctf)

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=772936

--- Comment #5 from Thibault Saunier <tsaunier at gnome.org> ---
Created attachment 337722
  --> https://bugzilla.gnome.org/attachment.cgi?id=337722&action=edit
tracerrecord: Rationalize environment variables

Use one single environment variable to define the output format:
GST_DEBUG_FORMAT, you can pass extra arguments in the variable,
and for example you will need to define where to output the CTF
logs in the form: `ctf,dir=/dir/where/to/output/ctf/traces/`.

Also added support to set the equivalent of GST_DEBUG_FILE
doing `GST_DEBUG_FORMAT=gst,file=debug.log`

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