99% fix scoring with warps and fakes.

Now all charts can seek 100%.

This does force yet another cache reload.

Hopefully it won't slow first loads too much.

src/Song.cpp

@@ -41,7 +41,7 @@
  * @brief The internal version of the cache for StepMania.
  *
  * Increment this value to invalidate the current cache. */
-const int FILE_CACHE_VERSION = 179;
+const int FILE_CACHE_VERSION = 180;
 
 /** @brief How long does a song sample last by default? */
 const float DEFAULT_MUSIC_SAMPLE_LENGTH = 12.f;