* Added a new very simple audio plugin for Win32. This plugin uses the
    waveOut API which is a lot easier to use for streaming stuff than
    directsound. (you don't have to take care of underflows anymore
    because it doesn't use circular buffers).
    If you are having a lot of underflows, this plugin is currently
    better adapted than the directx plugin.

* Moved some initialization stuff in audio_out.c so we can now the
    caracteristics of the audio stream before calling aout_Open().