New winetricks 20080309: new verb 'icodecs'

[Dan Kegel]

Intel codecs are needed to run Tonka Search & Rescue 2
(which my son likes), so I added them to winetricks as 'icodecs'.

I also renamed allvcodecs to be allcodecs (since it's hard
to separate audio from video codecs sometimes)
and removed a spurious warning from wsh56.

As always, winetricks is at
  http://kegel.com/wine/winetricks
and
  http://winezeug.googlecode.com