Make WaveformProperties final.

src/waveform/renderers/waveformmarkproperties.cpp

@@ -8,10 +8,6 @@ WaveformMarkProperties::WaveformMarkProperties()
     : m_iHotCue(-1) {
 }
 
-WaveformMarkProperties::~WaveformMarkProperties() {
-}
-
-
 WaveformMarkProperties::WaveformMarkProperties(const QDomNode& node,
                                                const SkinContext& context,
                                                const WaveformSignalColors& signalColors)

src/waveform/renderers/waveformmarkproperties.h

@@ -7,13 +7,12 @@
 class SkinContext;
 class WaveformSignalColors;
 
-class WaveformMarkProperties {
+class WaveformMarkProperties final {
   public:
     WaveformMarkProperties();
     WaveformMarkProperties(const QDomNode& node,
                            const SkinContext& context,
                            const WaveformSignalColors& signalColors);
-    virtual ~WaveformMarkProperties();
 
     QColor m_color;
     QColor m_textColor;