[Bug 757045] tracer: Emit 'element-new' hook when using parse_launch

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=757045

--- Comment #3 from Thiago Sousa Santos <thiagossantos at gmail.com> ---
Created attachment 314341
  --> https://bugzilla.gnome.org/attachment.cgi?id=314341&action=edit
element: emit tracer's element-new hook from 'constructed'

Was also in need with this so here's the patch I'm using

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