remove DIFFICULTIESTOHIDE. It's redundant with "nodifficult"

stepmania/src/Course.cpp

@@ -274,24 +274,6 @@ void Course::LoadFromCRSFile( CString sPath )
 			rv.FromString( sParams[3] );
 			m_RadarCache[CacheEntry(st, cd)] = rv;
 		}
-		else if( !stricmp(sValueName, "DIFFICULTIESTOHIDE") )
-		{
-			m_vDifficultiesToHide.clear();
-			for( unsigned i=1; i<sParams.params.size(); i++ )
-			{
-				CourseDifficulty cd = StringToCourseDifficulty( sParams[i] );
-				m_vDifficultiesToHide.insert( cd );
-			}
-		}
-		else if( !stricmp(sValueName, "DIFFICULTIESTOHIDE") )
-		{
-			m_vDifficultiesToHide.clear();
-			for( unsigned i=1; i<sParams.params.size(); i++ )
-			{
-				CourseDifficulty cd = StringToCourseDifficulty( sParams[i] );
-				m_vDifficultiesToHide.insert( cd );
-			}
-		}
 		else
 		{
 			LOG->Trace( "Unexpected value named '%s'", sValueName.c_str() );
@@ -371,7 +353,6 @@ void Course::Init()
 	m_sBannerPath = "";
 	m_sCDTitlePath = "";
 	m_iTrailCacheSeed = 0;
-	m_vDifficultiesToHide.clear();
 }
 
 void Course::Save( CString sPath, bool bSavingCache )
@@ -397,15 +378,6 @@ void Course::Save( CString sPath, bool bSavingCache )
 	if( m_iLives != -1 )
 		f.PutLine( ssprintf("#LIVES:%i;", m_iLives) );
 
-	{
-		CString s;
-		FOREACHS_CONST( CourseDifficulty, m_vDifficultiesToHide, cd )
-			s += CourseDifficultyToString( *cd ) + ',';
-		if( !s.empty() )
-			s.erase( s.end()-1 );	// erase last ','
-		f.PutLine( "#DIFFICULTIESTOHIDE:" + s + ";" );
-	}
-
 	FOREACH_CourseDifficulty( cd )
 	{
 		if( m_iCustomMeter[cd] == -1 )
@@ -816,10 +788,6 @@ bool Course::GetTrailUnsorted( StepsType st, CourseDifficulty cd, Trail &trail )
 	case DIFFICULTY_BEGINNER:
 	case DIFFICULTY_CHALLENGE:
 		return false;
-	default:
-		if( m_vDifficultiesToHide.find(cd) != m_vDifficultiesToHide.end() )	// found a match
-			return false;
-		break;
 	}
 
 	//

stepmania/src/Course.h

@@ -163,8 +163,6 @@ private:
 	bool GetTrailUnsorted( StepsType st, CourseDifficulty cd, Trail &trail ) const;
 	bool GetTrailSorted( StepsType st, CourseDifficulty cd, Trail &trail ) const;
 
-	set<CourseDifficulty> m_vDifficultiesToHide;
-
 	typedef pair<StepsType,Difficulty> CacheEntry;
 	struct CacheData
 	{