(svn r2866) Move all functions and tables which aren't directly involved in managing the sprite heap to a new file gfxinit.c.

This doesn't ease the global variable mess, but makes the distinction between sprite heap and gfx loading routines easier.

spritecache.h

@@ -24,7 +24,10 @@ static inline const byte *GetNonSprite(SpriteID sprite)
 	return GetRawSprite(sprite);
 }
 
-void GfxLoadSprites(void);
+void GfxInitSpriteMem(void);
 void IncreaseSpriteLRU(void);
 
+bool LoadNextSprite(int load_index, byte file_index);
+void SkipSprites(uint count);
+
 #endif