initial Interplay video decoder

Originally committed as revision 2275 to svn://svn.ffmpeg.org/ffmpeg/trunk

Changelog

@@ -3,7 +3,7 @@ Upcoming version 0.4.8:
 - Wing Commander III Movie (.mve) file playback subsystem (Mike Melanson
   and Mario Brito)
 - Xan DPCM audio decoder (Mario Brito)
-- Interplay MVE demuxer and DPCM audio decoder (Mike Melanson)
+- Interplay MVE playback subsystem (Mike Melanson)
 - Duck DK3 and DK4 ADPCM audio decoders (Mike Melanson)
 
 version 0.4.7:

doc/ffmpeg-doc.texi

@@ -681,6 +681,7 @@ following image formats are supported:
 @item Sony Playstation MDEC  @tab     @tab  X 
 @item Id RoQ                 @tab     @tab  X @tab used in Quake III, Jedi Knight 2, other computer games
 @item Xan/WC3                @tab     @tab  X @tab used in Wing Commander III .MVE files
+@item Interplay Video        @tab     @tab  X @tab used in Interplay .MVE files
 @end multitable
 
 @code{X} means that the encoding (resp. decoding) is supported.