freeimage: Create freeimage plugin and freeimagedec decoder

ext/freeimage/gstfreeimage.h

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+/* GStreamer
+ * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
+ *
+ * Filter:
+ * Copyright (C) 2000 Donald A. Graft
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ *
+ */
+
+#include <gst/gst.h>
+#include <FreeImage.h>
+
+//GType gst_pngenc_get_type (void);
+//
+//extern GstPadTemplate *gst_png_sink_factory ();
+//extern GstPadTemplate *gst_png_src_factory ();