Fix compiler warining non-virtual destructor

ref:
https://stackoverflow.com/questions/38407723/how-to-delete-an-object-of-derived-class-that-has-no-dstructor

sources/properties/propertiesinterface.cpp

@@ -20,3 +20,8 @@
 PropertiesInterface::PropertiesInterface()
 {
 }
+
+PropertiesInterface::~PropertiesInterface()
+{
+
+}

sources/properties/propertiesinterface.h

@@ -30,6 +30,7 @@ class PropertiesInterface
 {
 	public:
 	PropertiesInterface();
+	virtual ~PropertiesInterface();
 	// Save/load properties to setting file. QString is use for prefix a word befor the name of each paramètre
 	virtual void toSettings	  (QSettings &settings, const QString = QString()) const =0;
 	virtual void fromSettings (const QSettings &settings, const QString = QString()) =0;