Fixes #2272 and other problems with the templates

Removes the non-intuitive saving of the default template in
MainWindow::createNewProject.

Other fixed problems:
* User entries were not shown in the menu of the tool button that
creates new projects from templates. Now they are shown as well.

Other changes:
* Adds a new option "New from template" in the file menu. It shows the
same menu as the tool button.

include/ConfigManager.h

@@ -120,6 +120,11 @@ public:
 		return dataDir() + PROJECTS_PATH;
 	}
 
+	QString factoryTemplatesDir() const
+	{
+		return factoryProjectsDir() + TEMPLATE_PATH;
+	}
+
 	QString factoryPresetsDir() const
 	{
 		return dataDir() + PRESETS_PATH;