Patches for music and movies

[Pierre Willenbrock]

These patches enable streaming audio support and movie playback.
The patches are against current cvs. You still need to put MVE=yes into 
your Makefile to make freespace use the movie support.
So far the code is tested on an Athlon 1400 and a Duron 600, both with 
up-to-date gentoo, with varying degrees of frameskiping in movie 
playback, but sound is working flawlessly.

Here are the changes made:
mvelib.cpp:
   changed file reading mechanism to use cfile
mvelib.h:
   changed filename parameters from (const char *) to (char *)(as needed
     by cfopen)
2d.cpp:
   added full gr_bitmap_ex support
decoder16.cpp:
   fixed bad memory pointer handling(it looks better, too)
movie.cpp:
   expanded search path for movies to ./:./movies/:./data/movies/
   implemented movie_play_two(needed after endgame)
mveplayer.cpp:
   fixed audio implementation
   added video implementation for unix via gr_bitmap_ex(it is slow)
   skips frames if needed
   movie can be stopped by hitting ESC
ds.cpp:
   changed playback samplerate to 44100(openAL has a bug in downsampling
     code, and the movies are 44100Hz)

acm-unix.cpp:
   implemented stream conversion
audiostr.cpp:
   implemented streaming audio
sound.cpp:
   enabled initialization of ACM for unix

Pierre
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