Python: Use new plugin items setup pattern for PythonEditor

Change-Id: Ie8516960a106ddeff415b6412d9af66f7d2f0f36
Reviewed-by: David Schulz <david.schulz@qt.io>

src/plugins/python/pythoneditor.h

@@ -4,18 +4,9 @@
 #pragma once
 
 #include <texteditor/textdocument.h>
-#include <texteditor/texteditor.h>
 
 namespace Python::Internal {
 
-class PythonEditorFactory : public TextEditor::TextEditorFactory
-{
-public:
-    PythonEditorFactory();
-private:
-    QObject m_guard;
-};
-
 class PythonDocument : public TextEditor::TextDocument
 {
     Q_OBJECT
@@ -29,4 +20,6 @@ signals:
     void pythonUpdated(const Utils::FilePath &python);
 };
 
+void setupPythonEditorFactory(QObject *guard);
+
 } // Python::Internal