Implement renaming of tools and categories.

Not possible to reset them yet.
Saves the change in the settings instead of writing new tools xml files.
This probably needs to be adapted for tools that are "local" from the
beginning.

src/plugins/coreplugin/dialogs/externaltoolconfig.h

@@ -55,14 +55,17 @@ public:
     ~ExternalToolConfig();
 
     void setTools(const QMap<QString, QList<ExternalTool *> > &tools);
+    QMap<QString, QList<ExternalTool *> > tools() const { return m_tools; }
 
     QString searchKeywords() const;
 
 private slots:
     void showInfoForItem(QTreeWidgetItem *item);
+    void updateItem(QTreeWidgetItem *item);
 
 private:
     Ui::ExternalToolConfig *ui;
+    QMap<QString, QList<ExternalTool *> > m_tools;
 };
 
 } // Internal