More aggressive caching. In general, this makes Stepmania avoid looking in the song directory at all if the song is in the cache, in order to load songs faster. All the RadarValue calculations were also rolled into one to reduce the time needed to build the cache.

src/GameConstantsAndTypes.h

@@ -41,6 +41,8 @@ enum RadarCategory
 	RadarCategory_Rolls, /**< How many rolls are in the song? */
 	RadarCategory_Lifts, /**< How many lifts are in the song? */
 	RadarCategory_Fakes, /**< How many fakes are in the song? */
+	// If you add another radar category, make sure you update
+	// NoteDataUtil::CalculateRadarValues to calculate it. -Kyz
 	NUM_RadarCategory,	/**< The number of radar categories. */
 	RadarCategory_Invalid
 };