* modules/codec/spudec/*: modified the spu decoder to handle text subtitles.

* modules/codec/spudec/*: modified the spu decoder to handle text subtitles.
   Only one format of text subtitles is supported right now but we should be able
   to expand this by modifying modules/codec/spudec/text.c.
   Most of this work comes from by Andrew Flintham ( thanks a bunch Andrew :).

* share/font-eutopiabold36.rle: new font for the text subtitler, courtesy of
   Andrew Flintham.

* AUTHORS: added Andrew Flintham to the authors file.

* modules/demux/ogg.c: modified the ogg demuxer to handle subtitles.

* modules/codec/ffmpeg/*: modified the ffmpeg decoder to always keep the last decoded
   frame linked.