big update of new generation version

- completely changed implementation, now there is 2 layers deault.py (xbmc
  imports) and mpdconrol.py (unrelated to xbmc)
- added search support (albums, artists, songs)
- removed unused settings
- new icons

what works:
 - player controls
 - artist browser, file browser, playlist browser
 - adding to queue (everything listed)
 - listening to stream, auto-listen in xbmc
 - search