added dummyTrackContainer with dummyInstrumentTrack in order to have a default-model for cached inactive instrument-track-windows - fixes regular crashes

git-svn-id: https://lmms.svn.sf.net/svnroot/lmms/trunk/lmms@863 0778d3d1-df1d-0410-868b-ea421aaaa00d

include/engine.h

@@ -126,6 +126,11 @@ public:
 		return( s_ladspaManager );
 	}
 
+	static dummyTrackContainer * getDummyTrackContainer( void )
+	{
+		return( s_dummyTC );
+	}
+
 	static float framesPerTact64th( void )
 	{
 		return( s_framesPerTact64th );

include/instrument_track.h

@@ -223,6 +223,9 @@ public:
 
 	void freeInstrumentTrackWindow( void );
 
+	static void cleanupWindowPool( void );
+
+
 private slots:
 	void toggledInstrumentTrackButton( bool _on );
 	void activityIndicatorPressed( void );

include/preset_preview_play_handle.h

@@ -46,7 +46,7 @@ public:
 	virtual bool isFromTrack( const track * _track ) const;
 
 	static void init( void );
-	static void cleanUp( void );
+	static void cleanup( void );
 	static constNotePlayHandleVector nphsOfInstrumentTrack(
 						const instrumentTrack * _ct );