Plugins cleanup:

Plugins cleanup:

Original commit message from CVS:
Plugins cleanup:
* stereo2mono, mono2stereo, int2float, float2int: replaced by audioconvert.
* stereosplit replaced by oneton.
* vumeter replaced by level (and was broken anyway).
* avifile replaced by ffmpeg.
* mjpegtools duplicates functionality of jpeg. jpeg now works with jpeg-mmx,
too, which makes mjpegtools unneeded.
* allow for jpegmmx instead of jpeg.
* openquicktime replaced by qtdemux and ffmpeg. Broken anyway.
* XMMS is broken and will never be fixed.
* vga is broken and will not be fixed anywhere soon.
* videosink has never worked. If it works, add it back to replace xvideosink.