initial work to move everything into the propertiesinterface which is related to it

sources/editor/graphicspart/customelementpart.h

@@ -19,6 +19,7 @@
 #define CUSTOM_ELEMENT_PART_H
 
 #include "qet.h"
+#include "propertiesinterface.h"
 
 class CustomElement;
 class ElementPrimitiveDecorator;
@@ -35,7 +36,7 @@ class QGraphicsSceneMouseEvent;
 	is no point for those classes to store their visual representation with
 	anything more complex than a QImage.
 */
-class CustomElementPart {
+class CustomElementPart: public PropertiesInterface {
 	// constructors, destructor
 	public:
 	/**
@@ -55,14 +56,6 @@ class CustomElementPart {
 	
 	// methods
 	public:
-	/**
-		Load the primitive from an XML element that describes it
-	*/
-	virtual void fromXml(const QDomElement &) = 0;
-	/**
-		Export the primitive as an XML element
-	*/
-	virtual const QDomElement toXml(QDomDocument &) const = 0;
 	/**
 		Set a specific property of the primitive
 	*/