initial commit for Quicktime Animation (RLE) video decoder; bit depths

32, 24, and 16 are working; 8bpp is partially working; 4, 2, and 1 bpp
are not supported yet

Originally committed as revision 2748 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/allcodecs.c

@@ -153,6 +153,7 @@ void avcodec_register_all(void)
     register_avcodec(&roq_dpcm_decoder);
     register_avcodec(&interplay_dpcm_decoder);
     register_avcodec(&xan_dpcm_decoder);
+    register_avcodec(&qtrle_decoder);
 #endif /* CONFIG_DECODERS */
 
 #ifdef AMR_NB