Starting stub for hopeful cache reduction.

Now, let's see if we can pull this off.

src/NotesLoaderSM.cpp

@@ -638,6 +638,12 @@ bool SMLoader::LoadFromBGChangesString( BackgroundChange &change, const RString
 	return aBGChangeValues.size() >= 2;
 }
 
+bool SMLoader::LoadNotedataFromSimfile( const RString &path, Steps &out )
+{
+	// stub: do this later.
+	return false;
+}
+
 bool SMLoader::LoadFromSimfile( const RString &sPath, Song &out, bool bFromCache )
 {
 	LOG->Trace( "Song::LoadFromSMFile(%s)", sPath.c_str() );

src/NotesLoaderSM.h

@@ -41,6 +41,12 @@ struct SMLoader
 	 */
 	virtual void TidyUpData( Song &song, bool bFromCache );
 
+	/**
+	 * @brief Retrieve the relevant notedata from the simfile.
+	 * @param path the path where the simfile lives.
+	 * @param out the Steps we are loading the data into. */
+	virtual bool LoadNotedataFromSimfile(const RString &path, Steps &out );
+	
 	/**
 	 * @brief Attempt to load the specified sm file.
 	 * @param sPath a const reference to the path on the hard drive to check.