stop accessing m_vpSteps directly

stepmania/src/NotesLoaderBMS.cpp

@@ -454,7 +454,7 @@ bool BMSLoader::LoadFromDir( CString sDir, Song &out )
 		const bool ok = LoadFromBMSFile( out.GetSongDir() + arrayBMSFileNames[i], 
 			*pNewNotes );
 		if( ok )
-			out.m_vpSteps.push_back( pNewNotes );
+			out.AddSteps( pNewNotes );
 		else
 			delete pNewNotes;
 	}

stepmania/src/NotesLoaderDWI.cpp

@@ -473,7 +473,7 @@ bool DWILoader::LoadFromDWIFile( CString sPath, Song &out )
 				*pNewNotes
 				);
 			if(pNewNotes->m_StepsType != STEPS_TYPE_INVALID)
-				out.m_vpSteps.push_back( pNewNotes );
+				out.AddSteps( pNewNotes );
 			else
 				delete pNewNotes;
 		}

stepmania/src/NotesLoaderKSF.cpp

@@ -359,7 +359,7 @@ bool KSFLoader::LoadFromDir( CString sDir, Song &out )
 			continue;
 		}
 
-		out.m_vpSteps.push_back( pNewNotes );
+		out.AddSteps( pNewNotes );
 	}
 
 	return true;

stepmania/src/NotesLoaderSM.cpp

@@ -336,7 +336,7 @@ bool SMLoader::LoadFromSMFile( CString sPath, Song &out )
 		{
 			Steps* pNewNotes = new Steps;
 			ASSERT( pNewNotes );
-			out.m_vpSteps.push_back( pNewNotes );
+			out.AddSteps( pNewNotes );
 
 			if( iNumParams < 7 )
 			{
@@ -456,7 +456,7 @@ bool SMLoader::LoadEdit( CString sEditFilePath, ProfileSlot slot )
 				return false;
 			}
 
-			pSong->m_vpSteps.push_back( pNewNotes );
+			pSong->AddSteps( pNewNotes );
 			return true;	// Only allow one Steps per edit file!
 		}
 		else

stepmania/src/SongManager.cpp

@@ -277,7 +277,10 @@ void SongManager::LoadGroupSymLinks(CString sDir, CString sGroupFolder)
 			delete pNewSong; // The song failed to load.
 		else
 		{
-			pNewSong->m_vpSteps.clear();	// No memory hogs..
+			const vector<Steps*>& vpSteps = pNewSong->GetAllSteps();
+			while( vpSteps.size() )
+				pNewSong->RemoveSteps( vpSteps[0] );
+
 			pNewSong->m_BackgroundChanges.clear();
 
 			pNewSong->m_bIsSymLink = true;	// Very important so we don't double-parse later