Fix bug 'Incorrect property dialog display for class attributes, methods,...
Fix bug 'Incorrect property dialog display for class attributes, methods, enumeration values or key constrains in tree view'. Details: - Move up virtual method showPropertiesDialog() from ClassifierItemList to UMLObject to have properties dialog support for all uml objects. - Add default value to parent attribute of showPropertiesDialog(). - Implement missing methods showPropertiesDialog() used by the tree and the code editor - Implement fall back method showPropertiesDialog() to UMLObject. - Remove obsolate method showPropertiesPagedDialog(), which did not work as documented since KDE 4.0. BUG:342303 FIXED-IN:2.15.1 (KDE 14.12.1)