Use gst-python

[realies]

Currently, the CLI builds a pipeline by spawning a gst-launch instance which is primarily a debugging tool. While simple, gst-launch does not provide handlers for events such as a network disrupt or unsuitable input audio without doing silly things such as parsing the log. Transitioning the pipeline make-up to gst-python would provide various useful bindings that would allow for automating and further developing the tool while adding just a couple hundred of KBs to the project dependencies.