tty0 receives input while WindowServer is up, which meant that having
a shell on tty0 would cause commands typed into Terminal to run twice,
once in Terminal's shell, and once on the tty0 shell.
Long term we shouldn't send input to any VirtualConsole while the
WindowServer is up, so this just fixes the immediate weirdness. :^)
Also add an AudioServer that (right now) doesn't do much.
It tries to open, parse, and play a wav file. In the future, it can do more.
My general thinking here here is that /dev/audio will be "owned" by AudioServer,
and we'll do mixing in software before passing buffers off to the kernel
to play, but we have to start somewhere.
