gst/videoscale/gstvideoscale.*: Clean up, port to 0.9. Derives from BaseTransform, implements a transform_caps. Remov...

Original commit message from CVS:
2005-07-01  Andy Wingo  <wingo@pobox.com>

* gst/videoscale/gstvideoscale.c:
* gst/videoscale/gstvideoscale.h: Clean up, port to 0.9. Derives
from BaseTransform, implements a transform_caps. Removed dead code
including some PAR stuff that was never reached -- should probably
be added back somehow.