remove plugins now in gst-plugins-base

Original commit message from CVS:
remove plugins now in gst-plugins-base

ChangeLog

+2005-05-06  Christian Schaller  <uraeus@gnome.org>
+
+	* ext/alsa: removed plugins that are now in gst-plugins-base
+	* ext/gnomevfs:
+	* ext/theora:
+	* ext/vorbis:
+	* gst/adder:
+	* gst/audioconvert:
+	* gst/ffmpegcolorspace:
+	* gst/typefind:
+
 2005-05-06  Christian Schaller  <uraeus@gnome.org>
 
 	* gst-libs: Remove all files as this is in gst-plugins-base now