Audio plugin collection from DISTRHO (metapackage)

 Metapackage pulling-in collection of DPF-based plugins in
 LADSPA, DSSI, LV2 and VST2 formats.
 .
 The list of plugins/packs are:
  - glBars
  - Kars
  - Mini-Series (3BandEQ, 3BandSplitter, PingPongPan)
  - ndc-Plugs (Amplitude Imposer, Cycle Shifter, Soul Force)
  - MVerb
  - Nekobi
  - ProM