fluxbox: enable extended windowmanager hints

.. or gtk_window_maximize silently fails
xbmc: remove WM hacks. WM detection is fine now. dont set _NET_WM_STATE_FULLSCREEN
xf86-video-nvidia: downgrade to xf86-video-nvidia-331.49

... because I am stupid and I fail to read
bye bye dwm. we dont need you anymore
xbmc: update to xbmc-13-745067f
vdr-addon: remove vdr-sc
remove package: vdr-sc
vdr-addon: libtntnet.so.11 is enough