share ladspa-plugininstance between source&sink
share ladspa-plugininstance between source&sink

TODO: rename "channelinstance" to "plugininstance"
TODO: make sharing logic a bit more intelligent
         - only share if asking for the same klass
         - only share if we this is actually the same "virtual alsa device"
            (figure out how to do that)

iem-projects/alsa-ladspa-bridge