core: add debugging "magic" function

Just a UI way of turning on debug functionality

app/window/mainwindow/mainmenu.cpp

@@ -282,6 +282,11 @@ MainMenu::MainMenu(MainWindow *parent) :
 
   tools_preferences_item_ = tools_menu_->AddItem("prefs", Core::instance(), &Core::DialogPreferencesShow, tr("Ctrl+,"));
 
+#ifndef NDEBUG
+  tools_magic_item_ = tools_menu_->AddItem("magic", Core::instance(), &Core::SetMagic);
+  tools_magic_item_->setCheckable(true);
+#endif
+
   //
   // HELP MENU
   //
@@ -787,6 +792,9 @@ void MainMenu::Retranslate()
   tools_record_item_->setText(tr("Record Tool"));
   tools_snapping_item_->setText(tr("Enable Snapping"));
   tools_preferences_item_->setText(tr("Preferences"));
+#ifndef NDEBUG
+  tools_magic_item_->setText("Magic");
+#endif
 
   // Help menu
   help_menu_->setTitle(tr("&Help"));

app/window/mainwindow/mainmenu.h

@@ -287,6 +287,10 @@ private:
   QAction* tools_snapping_item_;
   QAction* tools_preferences_item_;
 
+#ifndef NDEBUG
+  QAction* tools_magic_item_;
+#endif
+
   Menu* help_menu_;
   QAction* help_action_search_item_;
   QAction* help_feedback_item_;