[Patch] RFC: gst-launch/gst-inspect support for presets

[Stefan Sauer]

hi,

I'd like to make the preset system a bit more useful. Please take a look
at the proposed patch in
https://bugzilla.gnome.org/show_bug.cgi?id=741427

Can be tested as:
gst-launch-1.0 audiotestsrc wave=ticks ! freeverb @preset="cathedral" !
pulsesink
gst-launch-1.0 audiotestsrc wave=ticks ! freeverb @preset="engine room" !
pulsesink

We could simplify the syntax:
... ! freeverb @"cathedral" ! ...

The @ syntax is inspired by what some command-line tools use to feed
parameters from a parameter file.

Stefan