made CLI rendering smoother

Suppressed a message box that would pop up in command
line interface causing a crash and made lmms act properly
when a rendering plugin fails. Need to figure out how to
terminate program in project_renderer line 222.

include/project_renderer.h

@@ -28,6 +28,7 @@
 #include "audio_file_device.h"
 #include "lmmsconfig.h"
 
+class QTimer;
 
 class projectRenderer : public QThread
 {
@@ -83,6 +84,10 @@ public:
 	static ExportFileFormats getFileFormatFromExtension(
 							const QString & _ext );
 
+	void setConsoleUpdateTimer(QTimer * t)
+	{
+		m_consoleUpdateTimer = t;
+	}
 
 public slots:
 	void startProcessing( void );
@@ -105,6 +110,8 @@ private:
 	volatile int m_progress;
 	volatile bool m_abort;
 
+	QTimer * m_consoleUpdateTimer;
+
 } ;