Parameter group highlight for free filter parameters

Source/PluginEditor.cpp

@@ -88,6 +88,9 @@ PaulstretchpluginAudioProcessorEditor::PaulstretchpluginAudioProcessorEditor(Pau
 			group_id = 2;
 		if (i == cpi_pitchshift)
 			group_id = 3;
+		if (i == cpi_freefilter_scaley || i == cpi_freefilter_shiftx || i == cpi_freefilter_shifty ||
+			i == cpi_freefilter_tilty)
+			group_id = 8;
 		m_parcomps.back()->m_group_id = group_id;
 		addAndMakeVisible(m_parcomps.back().get());
 	}