(svn r10092) -Codechange: code-seperated the spriteloader and blitter from the rest of the code

-Add: make it possible to pick your own blitter (-b <blitter>, -h for overview)
-Add: added a new optimized 8bpp blitter (default, caches sprites of all zoom-levels)
-Add: added a debug 8bpp blitter and a very slow normal 8bpp blitter

src/spritecache.h

@@ -6,7 +6,6 @@
 #define SPRITECACHE_H
 
 struct Sprite {
-	byte info;
 	byte height;
 	uint16 width;
 	int16 x_offs;