Move loaders into their own classes.

(These should have a common base class, but that can be done later;
I'm doing this to make it a bit more manageable so I can add the
new couples format to these.)

stepmania/src/NotesLoaderBMS.h

@@ -0,0 +1,14 @@
+#ifndef NOTES_LOADER_BMS_H
+#define NOTES_LOADER_BMS_H
+
+#include "Song.h"
+#include "Notes.h"
+
+class BMSLoader {
+	bool LoadFromBMSFile( const CString &sPath, Notes &out );
+
+public:
+	bool LoadFromBMSDir( CString sDir, Song &out );
+};
+
+#endif