add [MusicWheel] RecentSongsToShow metric

--------
cleanup
small amount of work on guitar-five (still incomplete)
add more commented out stuff for replay data playback
debug trace combo in order to find out issues with smo-ssc
added old packet names as comments in NetworkSyncManager.h

src/ScreenWithMenuElements.cpp

@@ -114,7 +114,7 @@ void ScreenWithMenuElements::Init()
 	this->AddChild( &m_Cancel );
 	LOAD_ALL_COMMANDS( m_Cancel );
 
-	/* Grab the music path here; don't GetPath during BeginScreen. */
+	// Grab the music path here; don't GetPath during BeginScreen.
 	if( PLAY_MUSIC )
 		m_sPathToMusic = THEME->GetPathS( m_sName, "music" );
 }