New dialog: Replace "Preferred wizards" concept by remembering the last category

Reviewed-by: trustme

src/plugins/coreplugin/coreimpl.h

@@ -47,8 +47,6 @@ public:
     QStringList showNewItemDialog(const QString &title,
                                   const QList<IWizard *> &wizards,
                                   const QString &defaultLocation = QString());
-    void setNewItemDialogPreferredWizardKinds(IWizard::WizardKinds kinds);
-    IWizard::WizardKinds newItemDialogPreferredWizardKinds() { return m_preferredWizardKinds; }
     bool showOptionsDialog(const QString &group = QString(),
                            const QString &page = QString(),
                            QWidget *parent = 0);
@@ -93,8 +91,6 @@ public:
 private:
     MainWindow *m_mainwindow;
     friend class MainWindow;
-
-    IWizard::WizardKinds m_preferredWizardKinds;
 };
 
 } // namespace Internal