Fix loading of steps from .sm files.

Some files were using non standard difficulty names
that weren't being caught properly.

Docs/Changelog_sm5.txt

@@ -11,6 +11,8 @@ StepMania 5.0 $next | 2011????
 2011/09/23
 ----------
 * [ScreenEvaluation] Added RollingNumbersMaxComboClass metric. [AJ]
+* [NotesLoaderSM] Fix loading .sm files with non standard difficulty names.
+  It should be Hard, not Heavy. [Wolfman2000]
 
 2011/09/22
 ----------

src/NotesLoaderSM.cpp

@@ -88,7 +88,7 @@ void SMLoader::LoadFromTokens(
 	out.SetDescription( sDescription );
 	out.SetCredit( sDescription ); // this is often used for both.
 	out.SetChartName(sDescription); // yeah, one more for good measure.
-	out.SetDifficulty( StringToDifficulty(sDifficulty) );
+	out.SetDifficulty( OldStyleStringToDifficulty(sDifficulty) );
 
 	// Handle hacks that originated back when StepMania didn't have
 	// Difficulty_Challenge. (At least v1.64, possibly v3.0 final...)
@@ -669,7 +669,8 @@ bool SMLoader::LoadNoteDataFromSimfile( const RString &path, Steps &out )
 			
 			if(!(out.m_StepsType == GAMEMAN->StringToStepsType( stepsType ) &&
 			     out.GetDescription() == description &&
-			     out.GetDifficulty() == StringToDifficulty(difficulty)))
+			     (out.GetDifficulty() == StringToDifficulty(difficulty) ||
+				  out.GetDifficulty() == OldStyleStringToDifficulty(difficulty))))
 			{
 				continue;
 			}

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 = 205;
+const int FILE_CACHE_VERSION = 206;
 
 /** @brief How long does a song sample last by default? */
 const float DEFAULT_MUSIC_SAMPLE_LENGTH = 12.f;