mplayer2: move to superenv
mplayer2: factor out VERSION writing to a separate class
mplayer2: add lcms2 as a dependency
mplayer2: generate Mac OSX Application bundle

This will be extremely helpful for users, as I've come to realize they are
hacking together Automator scripts (yuck!).

To disable and just install the CLI version use `--without-bundle` option when
running the formula.
mplayer2: disable x11 by default

Make sure we don't link to X11 at all (since this can cause problems with
supervenv) unless the user asks for it.