(svn r2962) - const correctness for all Get* functions and most Draw* functions that don't change their pointer parameters

- change a lot of byte player types to PlayerID
- beautify header files, same "#endif /* filename */" ending

spritecache.h

@@ -31,4 +31,4 @@ bool LoadNextSprite(int load_index, byte file_index);
 void DupSprite(SpriteID old, SpriteID new);
 void SkipSprites(uint count);
 
-#endif
+#endif /* SPRITECACHE_H */