gst/audioconvert/bufferframesconvert.c: New element to convert buffer-frames for...

gst/audioconvert/bufferframesconvert.c: New element to convert buffer-frames for float streams. Not working nicely yet.

Original commit message from CVS:
2004-04-09  Andy Wingo  <wingo@pobox.com>

* gst/audioconvert/bufferframesconvert.c: New element to convert
buffer-frames for float streams. Not working nicely yet.
* gst/audioconvert/plugin.h:
* gst/audioconvert/plugin.c: New files.
* gst/audioconvert/Makefile.am: Build the new files.
* gst/audioconvert/gstaudioconvert.c: Initialize via plugin.[ch].