fea) 배치 렌더링 시 직전 렌더링의 잔향이 앞에 나오는 이슈 해결 (#12)

* Fix reverb tail from previous render appear at the beginning

Makes connnection to updateSampleRate use Qt::DirectConnection.
This will ensure plugin reset occurs before rendering starts.

plugins/vst_base/VstPlugin.cpp

@@ -160,7 +160,7 @@ VstPlugin::VstPlugin( const QString & _plugin ) :
 	connect( Engine::getSong(), SIGNAL( tempoChanged( bpm_t ) ),
 			this, SLOT( setTempo( bpm_t ) ), Qt::DirectConnection );
 	connect( Engine::mixer(), SIGNAL( sampleRateChanged() ),
-				this, SLOT( updateSampleRate() ) );
+				this, SLOT( updateSampleRate() ), Qt::DirectConnection );
 
 	// update once per second
 	m_idleTimer.start( 1000 );